x² + 12x - 64 = x² + 16x - 4x - 64 = (x² + 16x) - (4x + 64) =
= x(x + 16) - 4(x + 16) = (x + 16)(x - 4)
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x² + 12x - 64 = x² + 16x - 4x - 64 = (x² + 16x) - (4x + 64) =
= x(x + 16) - 4(x + 16) = (x + 16)(x - 4)