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

The first term of a geometric sequence is −8100 . The common ratio of the sequence is −0.1 .


What is the 6th term of the sequence?

Answers

Answer:

-8100 x (-0.1)5

Step-by-step explanation:

The 6th term of the sequence is -0.081.

What is geometric sequence?

A geometric sequence can be defined as the sequence of numbers where any two consecutive terms have the same ratio. This ratio is called the common ratio of the sequence.

Given that,

The first term of the geometric sequence is, a₁ = -8100.

The common ratio is r = -0.1.

The general expression for the nth term is given as,

aₙ = a₁rⁿ⁻¹

Substitute n = 6 to obtain,

a₆ = -8100 × (-0.1)⁶⁻¹

    = -8100 × (-0.1)⁵

    = -0.081

Hence, the 6th term of the given sequence is -0.081.

To know more about geometric sequence click on,

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help me please!!!

tell me what numbers i'm suppose to put and where i'm suppose to put it, and tell me the remainder

R. is remainder

dont guess please this is important

Answers

Answer:

304

R is 0

.................

This should be your answer

Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar.
Represent the measurement of angle B in the figure.



In the figure, angle A and angle D are complementary. The measurement of angle D is 45°. Complete the equation to solve for b, the measurement of angle B.

180 = __ + (90 –__ ) + b

Answers

Answer:

angle b is 45° as it is alternative angle of d so equal to d.

Step-by-step explanation:

now....

180 = 90+(90-45)+b

90+45+45

90+90

=180

What is the circumference of the crop circle?

Answers

Answer:

c is the correct answear

Step-by-step explanation:

Please help me! The questions are below! Thanks.

Answers

Answer:

A is 4 hours and 25 minutes. B is 3 hours and 15 minutes. C is 5 hours and 30 minutes. D is 4 hours and 5 minutes

Step-by-step explanation:

just look at the differences in time

A. 4 hours and 25 minutes
B.3 hours and 15 minutes
C.5 hours and 30 minutes
D. 4 hours and 5 minutes

Hope this helps :)

5. At the Copy Center, 19 copies cost $1.14. At that rate, how much will 50 copies
cost?

A. $2.15 B. $3.00 C. $2.25 D. $3.25

Answers

B- $3.00

19/1.14 = .06

.06 x 50 = $3.00
B. $3.00
Because if you divide 1.14 and 19 you get 0.06 multiply that by 50 you get 3.00

A sample of pure silicon has a volume of 350cm3 and a mass of826g, what is its density?

Answers

Answer:

Step-by-step explanation:

Density=mass/volume

Density=826/350

Density=2.36g/cm³

2.36 g/cm^3 should be the answer I think

Jana is buying a cell-phone plan. She has two plans to choose from.

Plan A: $400 phone, $60/month
Plan B: $200 phone, $85/month
Write a system of equations .

Answers

Plan A: y = 400 + (60x)
Plan B: y = 200 + (85x)

AYO somebody help me im giving 12 points!! for this plz help
Use long Divistion to find the VALUE of 1,875 divided by 15 PLZZ if u can thanks so much its due today to 0.0 so HURRY

Answers

Answer:

125

Step-by-step explanation:

i looked it up

125 is the answer




1875 divided by 15 is 125 or you to prove that my answer is right do 125x15

PLEASE PLEASE PLEASE HELP I WILL MARK BRAINLIEST!!!!!
Working in cotton mill factories led to what common problems?
Group of answer choices

A.) busted knuckles

B.) lung problems

C.) back and neck problems

D.) loss of memory and balance

Answers

B, if they would breath in the air it would mess up there lungs

How many inches are in 200 meters?

Enter your answer in the box.

1 m ≈ 39.37 in.

Answers

Answer:

Step-by-step explanation:

1m = 39.37 inches

200 m = 200 x 39.37 = 7874

Answer: 7,874

Step-by-step explanation: I took the quiz (K12).

dexter needs to find each angle in this figure that is adjacent to (the second question)

Answers

It would be MOP is adjacent

The Adjacent angle to <LON are <NOP, <NOK and <LOK.

What are adjacent angle?

When two angles share a shared vertex and side, they are said to be neighbouring angles. The vertex of an angle is the terminal of the rays that create the sides of an angle. When two adjacent angles have a common vertex and side, they might be complimentary or supplementary angles.

Now, the adjacent angle to <LON are <NOP, <NOK and <LOK.

Dexter claim is wrong because <MON is not adjacent to <LON, <MON is just a part of <LON.

and, the part of an angle cannot be considered as Adjacent angle.

Learn more about Adjacent Angle here:

https://brainly.com/question/12838185

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Leah has two rectangles divided into the same number of equal parts. One rectangle has 1/2 of the parts shaded, and the other has 2/5 of the parts shaded.What is the least number of parts into which both rectangles could be divided

Answers

Answer:

9/10

Step-by-step explanation:

1/2x5=

5/10

2/5x2=

4/10

9/10

Mrs. Henry bought a used car for $13,600. She plans to make equal monthly payments for 4 years. How much is Mrs. Henry's monthly payment for the car

Answers

Objective:
So, have to figure out monthly payment.

There are 12 months in 1 year.
So, 12 months*4 years (multiply) = 48 months
Therefore, there are 48 months in the total of 4 years that Mrs. Henry has to pay for.

13,600(total car payment)/48(months)= $283 ($283.33333)

So, in conclusion, Mrs.Henry’s payment for the car will be $283/month.

Answer:

Mrs.Henry monthly payments would be $1,000

Step-by-step explanation:

the car she bought is $13,000,1,000 is a tenths of that so that her how much her monthly payment is

pls help! I need it asap!!!

Answers

the rate of change is 12,000
i’m actually questioning why u don’t know this but, the rate changes 12,000

PLEASE HELP!! pleaseee help!!

Answers

Answer:

14 or D

Step-by-step explanation:

Answer:

d is the class answer

Step-by-step explanation:

d.14

What are the variables in 3r + 2u + 7 + 5 + 4u + r

Answers

The variable terms are
3r, 2u, 4u, 1r,

help pls !!
If you eat a cheeseburger, are the molecules usable in this original form? Explain.

Answers

No because it has to be broken down and digested to be usable
It is not because the food has to be broken down and digested to be usable

I'm getting different answers to this question and I'm so confused-

True or False: The sum of two whole numbers is always larger than either whole number.

Answers

False if 0 is a whole number
True i think i’m not sure though, because:
1 + 1 = 2 which is greater
5 + 2 = 7 which is greater and so on

I NEED HELP ON THIS QUESTION PLSS.

Answers

The answer is D. 128

Answer: It's D

Step-by-step explanation:

If you get it right brainliest!!!! And the first one to answer it

Answers

Answer: 3/13

Step-by-step explanation: it goes down 2/13th’s every time.

It’s goes down 2 every time so it should be 3/13

Pls helpppppppp!!!!!!!!!!!!!!!!!!!!

I'll award brainliest

Answers

Answer:

I swear i had the exact same problem

Step-by-step explanation:

826 1/25

The tip of lighting rod will be 825.04 above sea level

solve the rational exponent: [tex]2^{x} =128[/tex]

Answers

Answer:

x = 7

Step-by-step explanation:

log(2^x)=log(128) (Take log of both sides)

x * (log(2)) = log(128)

x =  log(128)  / log(2)

x = 7

The base of an open rectangular box is of length(2x+5)cm and width xcm.

The area of this base is 58cm^2.

The height of the open box is (x-2)cm.

Answers

Answer:

Wait what's your question? You just gave us information on a box.

Step-by-step explanation:

1. During a field trip, 60 students are put into equal sized groups.
A) **Describe two ways to interpret 60 ÷5 in this context.





B) **Find the quotient.





C) Explain what the quotient would mean in each of the two interpretations you described.


NO WORK = NO CREDIT = RePOrt

Answers

If you use for fingers and count bye five you should eventually reach 60 and how ever many fingers you have up is your answer. Witch =7

Translate the figure below T(-2, 4) and name the coordinates of the new shape:
es003-1.jp

Answers

Answer:

(-3,5) (-6,5) (-3,9) (-6,9)

Step-by-step explanation:

hope this helps

My bad here yall go xecveuhjvj3kvcu3kvcurvqjmvhj it said it was too short.

Answers

Answer:

try 420.5

im pretty shure that will work

Step-by-step explanation:

Solve the problems. Remember to show your work.


624 x 16 = ?



6, 048 ÷ 8 = ?


Show your work on paper please

Answers

Answer:

1)9984 and 2) 756

Step-by-step explanation:

624

16

6x4=24

add the 2 on top

6x2=12+2=14

add the one on top

6x6=36+1=37

add a zero and now

1x4=4

1x2=2

1x6=6

add them up and you get 9984

Now for the second question

6,048 divided by 8

8 divided by 8=1

8 divided by 2 =2

8 divided by 6=1.3

and I got 756

The answer for the first one is 9,984. The answer for the second one is 756

need help again plsssss

Answers

Answer:

22.5

Step-by-step explanation:

It's simple math. Take 9 and multiply it with 2.5

9x2.5=22.5

Hope this helped!

Thanks!

Your friend in answering,

~Steve

Answer:

The correct answer is 22.5.

Step-by-step explanation:

If the scale factor is 2.5, the you multiply each base number by 2.5. So, 9×2.5= 22.5.

simplify 2^4 (2^3+2^2) please
Options

A) 4
B) 6
C) 12
D) 28

Answers

Answer:

A

Step-by-step explanation:

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