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16 July, 17:59

Factor the expression 16a^2 - 81

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  1. 16 July, 18:04
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    According to short multiplication formula - different of squares:

    a² - b² = (a - b) (a + b)

    16a² - 81 = (4a) ² - 9² = (4a - 9) (4a + 9)
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