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Verified answer
A. x²+16x+64=x²+8x+8x+64
=x(x+8)+8(x+8)
=(x+8)(x+8)
b. x²-12x+36
=x²-6x-6x+36
=x(x-6)-6(x-6)
=(x-6)(x-6)
b. (x - 6)^2