$\displaystyle 75r^2-27y^2$

What do I need to know to factor this...any helpful hints?

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- Mar 24th 2008, 02:35 AMmt_lapinAnother factoring problem
$\displaystyle 75r^2-27y^2$

What do I need to know to factor this...any helpful hints? - Mar 24th 2008, 03:52 AMmr fantastic
- Mar 24th 2008, 04:14 AMjames_bond
So the answer is: $\displaystyle 3 (5 r - 3 y) (5 r + 3 y)$.