Question

Question 13

Evaluate.

f(x)=3x−4, when x=−2

A
f(−2)=−10

B
f(−2)=−2

C
f(−2)=1

D
f(−2)=2

Answer 1

A. f(-2) = -10

Explanation:

Plug in -2 for the x-variable to get 3(-2)-4. Since you are multiplying a positive and a negative, it would be -6 for the first part. Subtract 4 to get -10 as your final answer.

Answer 2

A

f(-2) = -10

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Algebra I

• Function Notation

Explanation:

Step 1: Define

f(x) = 3x - 4

x = -2

Step 2: Evaluate

1. Substitute in x: f(-2) = 3(-2) - 4
2. Multiplication: f(-2) = -6 - 4
3. Subtraction: f(-2) = -10