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March 1, 2015

Posted by **Alisha** on Monday, November 28, 2011 at 6:06pm.

1) 8x^3 + 27y^3

2) u^3 + 125v^3

- math- factoring -
**MathMate**, Monday, November 28, 2011 at 6:15pmNote that

1) 8x^3+27y^3 ≡ (2x)^3+(3y)^3

and apply the following identity:

a^3+b^3 = (a+b)(a^2-ab+b^2)

hint: substitute a=2x, b=3y

2) same strategy as the first.

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