Question

A function is defined by f (x) = 5 (2 minus x). What is f(–1)? –5 5 15 53

Answer 1

15

Explanation:

f (x) = 5 (2 minus x)

Let x = -1

f (-1) = 5 (2 minus -1)

= 5( 2+1)

= 5(3)

=15

Answer 2

f(-1) = 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

• Functions
• Function Notation

Explanation:

Step 1: Define

Identify

f(x) = 5(2 - x)

Step 2: Evaluate

1. Substitute in x [Function f(x)]: f(-1) = 5(2 - -1)
2. (Parenthesis) Subtract: f(-1) = 5(3)
3. Multiply: f(-1) = 15