Mathematics, 09.02.2021 01:20 Vivi4558

Evaluate the following expression, when x=-2 2x^2+4x-3

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

Answers: 1

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Answers

Answer from: jadens25

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 from: ummammaar08

$\huge\boxed{\text{A) -3}}$

Step-by-step explanation:

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

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

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:

$2(-2)^2 = 2 \cdot (-2)^2 = 2 \cdot 4 = 8$

So the value of our first term is 8.

Our second term will be $4 \cdot -2 = -8$ , and our last term will remain -3.

Adding these values together:

8 - 8 - 3 = -3

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

Hope this helped!

Answer from: Quest

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step-by-step explanation:

Answer from: Quest

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Evaluate the following expression, when x=-2 2x^2+4x-3

A) 3
B) 3
C) -19

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