Question

Solve x2 – 64 = 0.

1. Isolate x2: x2 = 64
2. Apply the square root property of equality: Vx2 = /64
3. Isolate the variable: x= x=

Answer 1

-8, 8

Explanation:

x² - 64 = 0

x² = 64

x = +/- sqrt(64)

x = +/- 8

Answer 2

x = ±8

Explanation:

x^2 – 64 = 0

Add 64 to each side

x^2 – 64 +64= +64

x^2 = 64

Take the square root of each side

sqrt(x^2) = ±sqrt(64)

x = ±8