A*C = 64(1) = (-8)(-8). 64a^2 + (-8ab-8ab) + b^3 = Arrange the 4 terms to form 2 factorable pairs: (64a^2-8ab)) + (-8ab+b^2) = -8a(-8a+b) + b(-8a+b) = (-8a+b)(-8a+b).
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