Respuesta :

Space

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