Mathematics Middle School

Evaluate the following expression, when x=-2

2x^2+4x-3

A) 3
B) 3
C) -19
D) 9

Answers

Answer 1

Answer:

A) -3

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Step-by-step explanation:

Step 1: Define

2x² + 4x - 3

x = -2

Step 2: Evaluate

Substitute in x:                                                                                                2(-2)² + 4(-2) - 3Exponents:                                                                                                      2(4) + 4(-2) - 3Multiply:                                                                                                           8 - 8 - 3Subtract:                                                                                                          -3
Answer 2

Answer:

[tex]\huge\boxed{\text{A) -3}}[/tex]

Step-by-step explanation:

To find the value of this equation when [tex]x=-2[/tex], we can substitute this value inside the equation and use PEMDAS to successfully find the value.

With the expression of [tex]2x^2+4x-3[/tex], let's substitute -2 in as x.

[tex]2(-2)^2 + 4(-2) - 3[/tex]

Now let's follow PEMDAS to solve this equation.

PEMDAS states that when solving an expression/equation, the order we must follow is

ParenthesesExponentsMultiplication/DivisionAddition/Subtraction

We can now solve for this.

We see that exponents come before multiply and dividing. Therefore:

[tex]2(-2)^2 = 2 \cdot (-2)^2 = 2 \cdot 4 = 8[/tex]

So the value of our first term is 8.

Our second term will be [tex]4 \cdot -2 = -8[/tex], and our last term will remain -3.

Adding these values together:

[tex]8 - 8 - 3 = -3[/tex]

Therefore, the value of this expression when x = -2 is -3.

Hope this helped!

Related Questions

Can someone help me with this question? x-4<5

Answers

Answer

x < 9

Step-by-step explanation:

term , will be moved to the right side.

Notice that a term changes sign when it 'moves' from one side of the inequality to the other.

X < 9 I answered this problem on a other question

the second image is an example to help you solve this problem on the first image

Answers

Answer:I see no image

Step-by-step explanation:sorry

I’m pretty sure that it is 168

A smartphone originally worth $790 loses value at a rate of $175 each year. Write an equation to represent the value of the phone, then find the value of the phone after 4 years. Identify your variables.

Equation:

Solution:

Answers

the equation is 175*4=700
so its 790-700=90

PLS PLS PLS HELP!!!!!!!!!!!!!!!!!2

Answers

Answer:

B

Step-by-step explanation:

because.

It does not need rounded but I really need help!!

Answers

Answer:

The outside circle is: 95.3

The inside circle is: 113.1

Step-by-step explanation:

The outside circle is 97.3
I don’t k ow other one

What number should be subtracted from both sides of the following equation to solve for g?
g + 18 = 25
O 43
O 18
07
O 25

Answers

Answer:

18

Step-by-step explanation:

ur trying to get the g by itself so u subtract 18 both sides

For g+18=25 you would use 7 on both saids to get the answer

Help me please please

Answers

1. a=3
2. c=8.9
3. c=6.3
4. c=26
5. c=7.8
6. c=17
7. c=10
8. b=15
9. b=10.7
10. a=13.2
11. yes
12. no
13. yes
14. no
15. yes
16. no

Answer:

1. a=3

2. c=8.9

3. c=6.3

4. c=26

5. c=7.8

6. c=17

7. c=10

8. b=15

9. b=10.7

10. a=13.2

11. yes

12. no

13. yes

14. no

15. yes

16. no

If line segment AB is 400%, what is the length of a line segment that is 100%?
_____ inch(es)
(Type a whole number or a decimal) ​

Answers

4 divided by 4, equals 1 so that means that 100% out of 400% of the line is equal to 1 inch

If line segment AB is 400%, 1 in is the length of a line segment that is 100%.

What is percentage?

A percentage is a number or ratio that can be expressed as a fraction of 100. A percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%", although the abbreviations "pct.", "pct" and sometimes "pc" are also used. A percentage is a dimensionless number; it has no unit of measurement.

here, we have,

given that,

from the given diagram, we get,

the line AB = 4 in.

and,  line segment AB is 400%,

now, we have to find the length of a line segment that is 100%.

so, we get,

4 in = 400%

so, 100% = 4/ 400 * 100

               = 1 in.

Hence, If line segment AB is 400%, 1 in is the length of a line segment that is 100%.

To learn more on percentage click:

brainly.com/question/13450942

#SPJ2

third one lol you better make it dude :)) how school for you?

Answers

that’s really cool dude

wow thats so good i dont draw people or anime i like to draw nature or states stuff like that this is really good tho

It costs Shermano’s pizza $2 to make a pizza, if the markup is 550%, what is the selling price for a pizza? *

A. $11
B. $13
C. $12
D. $14.50

How much will 2 pizzas from Shermano’s cost, including 8.875% tax? *
10 points
A. $27.28
B. $34.75
C. $28.31
D. $14.15

Answers

Answer:

1) A

2)D

Step-by-step explanation:Your welcome

ANSWER: Shermano sells his pizza for $11

Which measure is equivalent to 3 mi?

1 ft = 12 in.

1 mi = 5280 ft




440 in.

15,840 in.

63,360 in.

Answers

Answer:

Answer: The 3 mi is equivalent to 190080 in.

Step-by-step explanation:

But when you convent 3 mi its is 15840 feet.

Hope that helps

:D

The answer is 15,840 inches

what is 1/3 devided by 3?

Answers

It is 1/9 as a fraction or 0.1111 as a decimal

Martin has four comic books and four novels. He wants to choose one comic book and one novel randomly. How many outcomes are in this sample space?

Answers

10 outcomes are in space

Answer:

10 outcomes. that is the answer to your question.

FILE ATTACHED TO QUESTION

Answers

Answer:

Henson: 3x + y = 236. Garcia: 2x + 3y = 218

Step-by-step explanation:

Henson:

Adult tickets are x, and they bought 3 adult tickets meaning they bought 3x. A kid tiket is y and they bought one kid ticket meaning they have 3 adult (x) + one kid (y). Their total price was 236 so it 3x + y = 236

Garcia:

They bought 2 adult tickets and 3 kid tickets. 2x's and 3y's. Their total price was 218, so 2x + 3y = 218

Please give brainliest :)

yo, reasking bc wrong grade level, how do you find the slope as a right triangle?​

Answers

Count down from the top one then count to the right or left ly
Count from top and then go right or left

whats 10x10x1+10+1+100?

Answers

Answer:

10x10x1+10+1+100

100+111

211 is the answer

Answer:

211

Step-by-step explanation:

10 * 10 = 100

100 * 1 = 100

100 + 10 = 110

110 + 1 = 111

111 + 100 = 211

What is the factorization of the polynomial below? 2x2 + 24x + 72​

Answers

2(x+6) squared

Hope I was right!
2x^2+24x+72

What two factors of 2 and 72=24
72x2=144

Two factors of 144 that = 24 are 12 and 12

2x^2+12x+12x+72

2x(x+6)12(x+6)

(2x+12)(x+6)

Above answer is correct

please help me with this

Answers

Answer:

0.6

Step-by-step explanation:

We know that there are 5 counters in total. 3 white and 2 black.

So we know that 3 out of 5 are white and 2 out of 5 are black.

Therefore the chance to get white is 3/5. And for black: 2/5.

We can turn these into decimals, 3/5 = 0.6 (You can make it 6/10 to make it easier.)

And 2/5 = 0.4 (You can make it 4/10 to make it easier.)

Answering the question, you should put your cross/marker on 0.6

Answer:

0.4

Step-by-step explanation:

Hope this helps!

Maybe brainliest?

for each graph shown tell whether it shows a proportional relationship

Answers

Answer:

a. yes, because there is a straight line that passes through the origin (0, 0). b. no, there is a straight line but it does not pass through the origin.

Step-by-step explanation:

There are 635,000 residents in Jones County and 12.8% are under the age of 5. Approximately how many residents are under the age of 5?

Answers

Answer:

81,280

Step-by-step explanation:

multiply the 635k to 0.128 to get 81,280

81,280 hope this helped :3

The base, b, has a length of 12 centimeters. The height, h, is 8 centimeters.



What is the length of s?



The length of s is
centimeters.

Answers

Answer:

b=12

h=8

s=b-h

s=12-8=4

s=4

HELLLLLLLLLLLLLLP PLLLLLLLSSS, I NEED HELP WITH THIS ANSWER
Which of the following values make the inequality x≤11 true?
Select all that apply.
1: -4
2: 11
3: 22
4: 15
5: 9.2
6: 3/4

I will give Brainliest for this.

Answers

It would be -4, and 9.2 because they sign is saying that x is less than or equal too 11.
1: -4, 2: 11, 5: 9.2

What is the length of the unknown side of the right triangle? (1 point)

PLEASE ANSWER ASAP!!! BRAINLIEST TO CORRECT ANSWER!!!
A right triangle with hypotenuse x and legs 5 and 12
Select one:
a. 13
b. 17
c. 25
d. 60

Answers

C, the answer is C.. trust me

I need help asap. i need to turn it in today​

Answers

Answer:

14) July

15) Snow. Because the temperature is below 0 (freezing point)

Answer

14. July

15. Snow, because it is below 32° (the real freezing temperature)

I’m soooo sorry but can y’all plzzz help me just a couple more times!

Answers

Answer:

26/35

Step-by-step explanation:

Each fraction is increasing by 1/35. Therefore, 25/35 + 1/35 = 26/35.

Answer:

[tex]\frac{26}{35}[/tex]

Step-by-step explanation:

We have four fractions and asked to find the next fraction in the sequence.

The four fractions are increasing one by one by first glance, therefore to find the answer we need to add 1/25 to the last value seen.

What is 1 + 25?

26

[tex]\frac{26}{35}[/tex]

Please Solve This
6-x=4(5+x)-4

Answers

Answer:

x= -2

Step-by-step explanation:

the answer to the problem is x=-2

plz help me plz plz plz asap PLZ PLZ PZL HELLLP
Country Carpets charges $22 per square yard for carpeting, and an additional installation fee of $100. City Carpets charges $25 per square yard for the same carpeting, and an additional installation fee of $70. Write an equation and solve to find the number of square yards of carpeting for which the total cost charged by the two companies will be the same.

Answers

Answer:

22x + 100 = 25x + 70, 10 yards

Step-by-step explanation:

Set the number of square yards of carpeting as x.

So, the cost of Country Carpets is: 22 * x + 100

And the cost of City Carpets is: 25 * x + 70.

In order for the costs to be the , the equations need to be equal.

22x + 100 = 25x + 70

Subtract 22x from both sides.

100 = 3x + 70

Subtract 70 from both sides.

3x = 30

x = 10

10 square yards

If they spent $7,258 on 19 ovens and a proportional amount on 4 refrigerators then how much was spent on the refrigerators?

Answers

Hi there!

What we know:

$7,258 on 19 ovens, 4 refreigerator.

Same amount cost each furnitures.

How we do this...

Divide the two terms:

[tex]7258[/tex]÷[tex]19=382[/tex]

Multiply the terms:

[tex]382[/tex]·[tex]4= 1528[/tex]

Final Result: 1528

Help and dont guess or ill report

Answers

Answer:

11 lessons +2/5th of a lesson

Step-by-step explanation:

360-85= 285

285/25 = 11.4

Answer is 11 lessons and 2/5th of a lesson

11 and 2/5 of a lesson

Simplify the expression: 2(4x+5)-12

Answers

8x -2

hope this helped
8x-2 is the correct answer
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