solve using perfect squre factoring patterns x^2-8x+16=25
(x^2) - 8x +16 = (x^2) - 4x - 4x + 16
= x(x-4) -4(x-4)
= (x-4)^2 = 25
taking square root of both sides
(x-4) = +/- 5 => x = 1 or x = -9
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