Factor 125X^3-27

i have no idea how to do it.

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2 Answers

125x^3 - 27
= (5x)^3 - 3^3
= (5x - 3)((5x)^2 + (5x)(3) + 3^2)
= (5x - 3)(25x^2 + 15x + 9)

Remember the formula:

x^3 - y^3 = (x - y)(x^2 + xy + y^2)
by

125x^3-27

5x^3-3^3

a=5x

b=-3

(a+b)(a^2-ab+b^2)

(5x-3) (25x^2+5x+9)smiley

by

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