How do you solve $x^2 = 64$ ?

Question

52323 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-11-01T04:10:32

$x=+-8$

$[1]" "x^2=64$

Subtract $64$ from both sides.

$[2]" "x^2-64=64-64$

$[3]" "x^2-64=0$

Factor out the quadratic equation. This is a special product (difference of two squares).

$[4]" "(x+8)(x-8)=0$

$[5]" "color(blue)(x=-8" or "x=8)$

How do you solve x^2 = 64x^2 = 64?