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solve by completing the square
x^2-12x=64

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x^2 - 12x + (12/2)^2 = 64 + (12/2)^2
x^2 - 12x + (6)^2 = 64 + (6)^2
x^2 - 12x + 36 = 64 + 36
x^2 - 12x + 36 = 100
(x-6) (x-6) = 100
square root of (x-6)^2 = square root of 100
x-6 = 10
x = 10 - 6
x = 4

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