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Math Help - Another factoring problem

  1. #1
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    Another factoring problem

    75r^2-27y^2

    What do I need to know to factor this...any helpful hints?
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  2. #2
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    Quote Originally Posted by mt_lapin View Post
    75r^2-27y^2

    What do I need to know to factor this...any helpful hints?
    Helpful hint: Always look for a common factor.

    =3([5r]^2 - [3y]^2).
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  3. #3
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    So the answer is: 3 (5 r - 3 y) (5 r + 3 y).
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