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= 8x^3 + 3(4x^2)(-5) + 6x(25) +(-125)
= 8x^3 + 12x^2(-5) + 150x - 125
= 8x^3 - 60^2 + 150 - 125
(3x+4)^3 = (3x)^3 + 3(3x)^2(4) + 3(3x)(4)^2 + (4)^3
= 27x^3 + 3(9x^2)(4) + 9x(16) + 64
= 27x^3 + 108x^2 + 144x + 64