Which are solutions of the equation x^2-16=0? Check all that apply.

x = 4

x = - 4

Step-by-step explanation:

Method 1: Quadratic Formula

Ignore the A before the ±, it wouldn't let me type it correctly.

x² - 16 = 0

a = 1

b = 0

c = - 16

Two separate equations

One must have a + (positive) and the other will have a - (negative).

x = 8 ÷ 2

x = 4

x = - 8 ÷ 2

x = - 4

Method 2: Factoring

x² - 16 = 0

(x - 4)(x + 4) = 0

Two separate equations

x - 4 = 0

x + 4 = 0

x - 4 = 0

x - 4 + 4 = 0 + 4

x = 4

x + 4 = 0

x + 4 - 4 = 0 - 4

x = - 4