Homework Help: algebra

Posted by ROCKY on Sunday, July 24, 2011 at 10:05pm.

Andrew factored the expression 20x^3-12x^2+8x as 4x(5x^2-12x^2+8x). But when Melissa applied the distributive law and multiplied out 4x(5x^2-12x^2+8x),she got 20x^3-48x^3+32x^2; thus, Andrew's solution does not appear to check. Why is that? Please help Andrew to understand this better. Explain your reasoning and correctly factor the original expression, if possible. If the expression is prime, state this.

algebra - Reiny, Sunday, July 24, 2011 at 11:19pm
Andrew messed up, should have been

= 4x(5x^2 - 3x + 2)

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