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21 October, 16:24

Factor the polynomial 25x^2-20xy + 4y^2

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  1. 21 October, 16:51
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    Recognize that (a-b) ^2=a^2-2ab+b^2

    so

    (5x) ^2-2 (2) (5) xy + (2y) ^2 = (5x-2y) ^2
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