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

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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)#