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1 February, 07:56

Which of the following represents the factored form of f (x) = x3 - 81x?

f (x) = x (x - 9) 2

f (x) = (x + 9) (x - 9)

f (x) = x (x + 9) (x - 9)

f (x) = x (x2 - 9)

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Answers (2)
  1. 1 February, 10:51
    0
    You're original equation has a - 81, so the factored form will have to have a positive and negative multiplying one another to achieve that ...

    f (x) = x (x + 9) (x - 9)
  2. 1 February, 10:59
    0
    F (x) = x^3 - 81x

    f (x) = x (x^2) + x (81)

    f (x) = x (x^2 - 81)

    f (x) = x (x^2 + 9x - 9x - 81)

    f (x) = x (x (x) + x (9) - 9 (x) - 9 (9))

    f (x) = x (x (x + 9) - 9 (x + 9))

    f (x) = x (x - 9) (x + 9)

    The answer is C.
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