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Factor the expression. 9b^2-25

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  1. 4 March, 02:36
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    you must factorize it as a difference of squares

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

    9b^2-25 = (3b) ^{2 - (5) ^2 = (3b-5) (3b+5)
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