$\displaystyle 75r^2-27y^2$ What do I need to know to factor this...any helpful hints?
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Originally Posted by mt_lapin $\displaystyle 75r^2-27y^2$ What do I need to know to factor this...any helpful hints? Helpful hint: Always look for a common factor. $\displaystyle =3([5r]^2 - [3y]^2)$.
So the answer is: $\displaystyle 3 (5 r - 3 y) (5 r + 3 y)$.
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