Question

If f(x) = 5x + 40. what is f(x) when x = -5?
a) -9
b) -8
c) 7
d) 15​

Answer 1

f(-5) = 15

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) = 5x + 40

x = -5

Step 2: Evaluate

1. Substitute in x: f(-5) = 5(-5) + 40
2. Multiply: f(-5) = -25 + 40
3. Add: f(-5) = 15