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12 November, 23:47

What is the factored form of the expression?

16b^2 - 81

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Answers (1)
  1. 13 November, 02:17
    0
    (4b-9) (4b+9)

    Step-by-step explanation:

    16b^2 - 81

    This is the difference of squares

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

    a^2 = 16b^2 so a = 4b

    c^2 = 81 so c = 9

    (16b^2 - 81) = (4b-9) (4b+9)
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