chứng minh mệnh đề sau bằng phương pháp phản chứng:
" Nếu phương trình bậc hai ax2+bx+c=0 vô nghiệm thì a và c cùng dấu"

Answers

Answer 1

Answer:

Which language is this ?????


Related Questions

PLz, Help fast! 100 points
A line is drawn on a scatter plot, as shown below:

A graph shows values till 10 on both x- and y axis with increments of 1.Dots are shown at 0.5, 7.5 and 1.8, 6.5 and 3, 6 and 4.4, 5 and 4.8, 4 and 5.9, 3.2 and 6.6, 2 and 7.5, 2.5 and 8, 1 and 8.8, 0. A straight line joins the ordered pairs 0, 7.9 and 10, 0.

Which statement best describes the line?

Answers

Answer:

It can be the line of best fit because it closely fits the data points.

Step-by-step explanation:

The line is near the data points and goes down from left to right just like the data points.  It is just above or just below the data points.

Answer:

guy above is right

Step-by-step explanation:

If (3x2 + 22x + 7) ÷(x + 7) = 3x + 1, then (x + 7)( ) = . The check of the polynomial division problem shows that the product of two polynomials is a polynomial. This supports the fact that the property is satisfied for polynomial multiplication.

Answers

Answer:

[tex](x + 7) * (3x + 1) = (3x^2 + 22x + 7)[/tex]

Step-by-step explanation:

Given

[tex](3x^2 + 22x + 7) \div (x + 7) = 3x + 1[/tex]

[tex](x + 7) * (\ ) = [\ ][/tex]

Required

Complete the blanks

We have:

[tex](3x^2 + 22x + 7) \div (x + 7) = 3x + 1[/tex]

Rewrite as:

[tex]\frac{(3x^2 + 22x + 7) }{ (x + 7)} = 3x + 1[/tex]

Cross multiply

[tex](x + 7) * (3x + 1) = (3x^2 + 22x + 7)[/tex]

Answer:

Answer B, C, C

find the value of 2 raise the power negative 6​

Answers

Answer:

1 /64

Step-by-step explanation:

2^-6

We know that a^-b = 1/a^b

1 / 2^6

1/64

Green Forest Park’s walking trail is 3.218 km. long. Blue Lake Park's walking trail is 2.414 km. long. How much longer is Green Forest Park’s trail than Blue Lake Park’s trail? GIVING 20 POINTS

Answers

Answer:

0.804

Step-by-step explanation:

Subtract 3.218 by 2.414

What is the numerical Absolute values of -16

Answers

Answer:

16

Step-by-step explanation:

The absolute value always gives a positive value , that is

| - a | = | a | = a , then

| - 16 | = | 16 | = 16

I need help PLZ thanks for your help
Image below

Answers

Answer:

3x - 14 = x + 30

[ Opposite angles of a ||gm are equal ]

=> 3x - x = 30+14

=> 2x = 44

=> x = 22

Therefore , option 4 is correct

hope that helps ✌

Graph
y = 3x^2.
Please thanks

Answers

Answer:

The image of the graph is below.

Step-by-step explanation:

WHERE ARE THE EXPERTS AND ACE!!!!!!! I NEED HELP PLS SHARE YO SMARTNESS!!!!! WILL GIVE BRAINLIEST AND RATE AND VOTE!!!

2 questions

Answers

Answer:

Confidence Interval - "P" values  

(0.4433 , 0.5444 )

~~~~~~~~~~~~~~~~~~~~~~~

[tex]\mathrm{Expand\:}\left(x+4y\right)^3:\quad x^3+12x^2y+48xy^2+64y^3[/tex]

in you image it is the last on "D"

Step-by-step explanation:

Confidence Level - "P" values  

99% 2.58

Confidence Interval - "P" values  

(0.4433 , 0.5444 )  

PLEASE HELP 25 MINUTES LEFT
38
Marlene wrote an arithmetic sequence where al
=
8 and the common difference is -3.
What is a rule for the nth term of this sequence?

Answers

Answer:

D

Step-by-step explanation:

The nth term of an arithmetic sequence is

[tex]a_{n}[/tex] = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here a₁ = 8 and d = - 3 , then

[tex]a_{n}[/tex] = 8 - 3(n - 1) = 8 - 3n + 3 = - 3n + 11 → D

The scatter plot below shows the relationship between years of education and income for a representative sample of adults.
Which of the following is the best estimate of the average change in a person's income that is associated with going to school for an additional year?
Choose 1 answer:
Choose 1 answer:

(Choice A)
A
$
1
$1dollar sign, 1

(Choice B)
B
$
2
$2dollar sign, 2

(Choice C)
C
$
3000
$3000dollar sign, 3000

(Choice D)
D
$
7000
$7000dollar sign, 7000

2
2
4
4
6
6
8
8
10
10
12
12
14
14
16
16
18
18
20
20
22
22
24
24
20000
20000
40000
40000
60000
60000
80000
80000Annual income (dollars)Years of education

Answers

Answer:

A

Step-by-step explanation:

khan

Create a triangle ABC of your choice. Using GeoGebra tools, construct the angle bisectors of ∠A and ∠B. Mark the intersection point of the angle bisectors, and label it point D.
Create a line through point D perpendicular to .
Find the intersection of line segment and the perpendicular line, and label it point E. With point D as the center, create a circle passing through point E.
Measure and label the radius of the inscribed circle of ΔABC on the diagram.
Take a screenshot of your result, and paste it below.

Answers

The steps to create attached screenshot of the inscribed circle of triangle ΔABC using GeoGebra tools includes;

1) Clicking on the Geometry link, under Powerful Math Apps group

2) On the opened Geometry page click on the Polygon icon and follow the instructions that come up, which is Select all vertices and then the first vertex (selected) again (a second time)

3) Once the triangle is created, select the Angle Bisector icon, under the Construct group; A message will appear, asking to Select three points or two lines, select three vertex, of the triangle created with a mouse click, with the vertex A in the center, such as BAC, or CAB a straight line representing the angle bisector of angle ∠A is created

4) Repeat the above to create the angle bisector of angle ∠B

5) Click on the Point button under the Basic Tools group, then click on the intersection of the two angle bisectors created above, the point will be automatically labelled point D

6) Click on the Perpendicular Line, icon under the Construct group, then click on point D, and then the line AB to draw the perpendicular from D to AB

7) Click on the point Point icon and then the intersection point of the perpendicular from D and AB to label the point E

8) Click on the Circle with Center basic tool and then points D and E above, to create the inscribed circle of triangle ΔABC

9) Select the Segment tool, then select the center of the circle and a point

on the circumference. Click on the label, from the pop up options, select

the label option AA then change the label of the segment created to Radius

and select Show Label and Show Value. The inscribed circle of ΔABC created with GeoGebra tools is attached

Learn more about GeoGebra hear;

https://brainly.com/question/10400398

Answer:

Step-by-step explanation: from edmentum

Find the area of a parallelogram with a base of 9m and a height of 5​

Answers

Answer:

A=45m²

Step-by-step explanation:

A=bh=9·5=45m²

A pair of parallel lines is cut by a transversal: 15 degrees and 80 degrees are the lines What is the measure of angle x?

60 degrees
65 degrees
70 degrees
80 degrees

Answers

Step-by-step explanation:

=80°-15°=65°

please mark this answer as brainlist

in the afternoon the temperature was 52 degrees. a strong arctic cold front caused the temperature tio drop 38 degrees in 4 3/4 hours. if the temperature continues to drop at thre same rate what will the temperature be after 2 hours?​

Answers

Answer:

5.9

Step-by-step explanation:

14 degrees dropped in 4 3/4, in one hour 56/19 degrees will drop. In two hours, 112/19=5.9 degrees will drop

Suppose that 65% of the people who inquire about investments at a certain brokerage firm end up investing in stocks, 38% end up investing in bonds, and 36% end up investing in both stocks and bonds. What is the probability that a person who inquires about investments at this firm will invest in stocks or bonds (or both)?

Answers

Answer:

0.67 = 67% probability that a person who inquires about investments at this firm will invest in stocks or bonds (or both).

Step-by-step explanation:

This question is solved treating these probabilities as Venn events.

I am going to say that:

Event A: Person invests in stocks.

Event B: Person invests in bonds.

65% of the people who inquire about investments at a certain brokerage firm end up investing in stocks

This means that [tex]P(A) = 0.65[/tex]

38% end up investing in bonds

This means that [tex]P(B) = 0.38[/tex]

36% end up investing in both stocks and bonds.

This means that [tex]P(A \cap B) = 0.36[/tex]

What is the probability that a person who inquires about investments at this firm will invest in stocks or bonds (or both)?

This is [tex]P(A \cup B)[/tex], given by the following equation:

[tex]P(A \cup B) = P(A) + P(B) - P(A \cap B)[/tex]

Considering the values we have for this problem:

[tex]P(A \cup B) = 0.65 + 0.38 - 0.36 = 0.67[/tex]

0.67 = 67% probability that a person who inquires about investments at this firm will invest in stocks or bonds (or both).

HELP ASAP LIKE PLEASE

Answers

Answer: (3b+2)(b+2)

Step-by-step explanation:

10 Adoya deposited sh 4000 for 2 years in a bank which paid 122% p.a. simple interest. What interest did he get after two years?​

Answers

Me too I need the answer

Arc measurement with equations

Answers

Answer:

thats the question?

Step-by-step explanation:

Find the real solution(s) of the following equation.
98 =
= 729
Choose all answers that apply:
A
8= 7
B
8= -7
8=9
D
8= -9
None of the above

Answers

Answer:

a=9

Step-by-step explanation:

a^3 = 729

Taking the cube root of each side

a^3 ^(1/3) = 729^ (1/3)

a = 9

If A = 2m + 1 and B 2m2 - 1 + 8m, find an expression that
equals 3 A + B in standard form.
Please help

Answers

Answer:

2m² + 14m + 2

Step-by-step explanation:

3A + B

= 3(2m + 1) + 2m² - 1 + 8m ← distribute parenthesis by 3

= 6m + 3 + 2m² - 1 + 8m ← collect like terms

= 2m² + 14m + 2 ← in standard form

what is the answer the / is division/divided? t+d/8-6

Answers

Answer:

t+d/2

Step-by-step explanation:

6. An integer Pis two thirds of another and their difference is 10. Find the two integers. an integer p is 2/3 of another and their difference is 10 find the two integers ​

Answers

Answer:

20, 30

Step-by-step explanation:

let the intergers be x and y

x = 2/3y

from this eqn, we know that y is larger.

hence, y-x=10

y-2/3y=10

1/3y=10

y=30

x=2/3y =2/3(30) = 20

What is the greatest counting number that divides 17, 25 and 41 and leaves the same remainder in each case?

Answers

The greatest counting number that divides 17, 25 and 41 and leaves the same remainder in each case is 8

Natalie bought 8 toys for $50. Which of the following has the same price per toy?

Answers

Well you didn’t put and options but the cost per toy is $6.25 so which ever is equal to that should be your answer.
50/8 =6.25

Answer:

The price per toy is $6.25.

Step-by-step explanation:

The price per toy is calculated by dividing the cost of all toys by the number of toys.

$50/8 = $6.25

The price per toy is $6.25.

Find the length of y. Assume the triangles are similar.\

A. 3.6
B. 3.2
C. 3.9
D. 3.4

Answers

6,3:y=4,2:2,4

y=3,6

Chọn a

a student takes a rectangular piece of paper 30 cm long and 21 cm wide find the area of the biggest circle that can be cut out from the paper also find the area of the paper left after cutting out the circle​

Answers

Answer:

Step-by-step explanation:

diameter of the circle=smallest of the length and width=21 cm

r=21/2

area of the circle=πr²=22/7 ×(21/2)²=(21×441)/(7×4)=1323/4=330.75 cm²

When 4x + 4x + 1 = 33 is solved, the result is:

Answers

Answer:

x = 4

Step-by-step explanation:

1. 8x+1 = 33 and the 4x together

2. 8x = 32 subtract 1 from each side

3. x = 4 Divide both sides by 8

Answer:

x=4

Step-by-step explanation:

4x+4x+1=33

Combine like (similar) terms:

8x+1=33

Rearrange terms to solve for x:

8x=33-1

8x=32

[tex]\frac{8x}{8} =\frac{32}{8}[/tex]

x=4

Therefore, x=4.

which of the following is a tinomial

Answers

B! There are three parts of the equation, hence "tri-"nomial :)
Good luck.

Find the slope of the line that passes through (7, 2) and (9, 9).

Simplify your answer and write it as a proper fraction, improper fraction, or integer.

Answers

Answer:

the slope is m=7/2

Step-by-step explanation:

Answer:

7/2

Step-by-step explanation:

what is the answer?

Answers

Answer:

3,6

Step-by-step explanation:

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Gabrielle's age is two times Mikhail's age. The sum of their ages is 54. What is Mikhail's age? I look at the worldFrom awakening eyes in a black face And this is what I see:This fenced-off narrow spaceAssigned to me.I look then at the silly wallsThrough dark eyes in a dark face And this is what I know:That all these walls oppression buildsWill have to go!I look at my own bodyWith eyes no longer blind And I see that my own hands can makeThe world that's in my mind.Then let us hurry, comrades,The road to find.Which detail from the poem best shows how the speaker wants to change the world?A"This fenced-off narrow space / Assigned to me." ( Lines 4-5)B"I look then at the silly walls / Through dark eyes in a dark face " ( Lines 6-7)C"That all these walls oppression builds / Will have to go!" ( Lines 9-10)D"I look at my own body / With eyes no longer blind " ( Lines 11-12) in 2020 the attendance at kennedy school's spring festival was 210. in 2021 the attendance was 168. What was tge percent change in the attendance from 2020 to 2022 tound to nearest whole percent how are 1 and 2 relatedA. They are supplementary B. They are complementary C. They are VerticalD. They are adjacent How much larger is 8 x 10^8 compared to 2 x 10^5? 4 times largerO 40 times largerO 400 times largerO 4,000 times larger Students at a major university must go through several registration steps. Officials have observed that it is typically the case that the waiting line at the fee-payment station is the longest. This would seem to suggest that the fee-payment station is the ___________ in the student registration process. Multiple Choice capacity cushion first station bottleneck economy of scale diseconomy of scale which was the warmest climate colony that focused on plantations Which type of abuse involves the intention to hurt someone by way of insults, repeated threats, or constant criticism. A physical abuse. B emotional abuse. C domestic violence. D mental abuse HELP ME OUT PLEASE!!! According to the passage, which of these is true about seaplanes? A) They can carry large shipments of cargo. B) They are more practical than other planes. C) They can land in places other planes cannot. D) They are still used regularly by the military. Can someone type this up for me HELP ME PLZ THIS IS CONFUSING TYSMFrom graph A, name a weathering process that you would expect where there is amean annual temperature of -10 C and mean annual rainfall of 800 mm.From graph B, name a weathering process that you would expect at a mean annual temperature of 18 degrees c and mean annual rainfall of 1400mm CivicsWhat percentage of state legislatures must ratify a proposed amendment before it is addedto the Constitution?seventy-five percentsixty-six percenteighty percentfifty percent Solve for the value of X Which best defines color? (1 point)a physical property of matter related to how a material interacts with different wavelengthsof lighta chemical property of matter related to how a material interacts with different wavelengthsof lightO a physical property of matter related to a material's ability to reflect lightO a chemical property of matter related to a material's ability to reflect light The two triangle shown below are similar triangles.What is the value of d in meters? Another one for you guys the process of diffusion occur when? Understanding that protection of sensitive unclassified information is: HELP ASAP! QUICK ALGEBRA 20 POINTS!!!!!!! WILL AWARD BRAINLIEST A Chef is looking for a new frying pan that will allow her to cook food quickly at temperatures above 500C. Use the data provided in the table to explain to the Chef which metal would be the best choice for a new frying pan for her kitchen. What is your claim? Which metal is the best choice? (What is your evidence? What is your reasoning?