Respuesta :

CHERLYNnotCHERRY

Answer:

The value of x is -8 and 8

Step-by-step explanation:

By following the steps you had given :

1.

x² - 64 = 0

x² = 64

2.

x² = 64

x = +-√64

3.

x = +√64

= +8

x = -√64

= -8