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15 January, 09:34

How to Factor 4x^2 - 121

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  1. 15 January, 13:24
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    Difference of 2 perfect squares

    for

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

    so

    (2x) ^2 - (11) ^2 = (2x-11) (2x+11)
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