Question

F (x) = x^2 + 4x; Find f (−7)

Answer 1

Answer:

f(-7) = 21

General Formulas and Concepts:

Pre-Alg

• Order of Operations: BPEMDAS

Step-by-step explanation:

Step 1: Define

f(x) = x² + 4x

f(-7) is x = -7

Step 2: Solve

1. Substitute:                    f(-7) = (-7)² + 4(-7)
2. Evaluate:                       f(-7) = 49 + 4(-7)
3. Multiply:                        f(-7) = 49 - 28
4. Subtract:                       f(-7) = 21