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28 April, 00:24

If f (x) = x^3-5x^2+kx-3 and f (3) = -15, find k

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Answers (2)
  1. 28 April, 03:11
    0
    Step-by-step explanation:

    f (x) = x^3-5x^2+kx-3

    f (3) = 3^3 - 5*3^2 + k*3 - 3

    =27 - 5*9 + 3k - 3

    =24 - 45 + 3k

    -15 = - 21 + 3k

    -15 + 21 = 3k

    6 = 3k

    divide both by 3

    k = 2
  2. 28 April, 04:05
    0
    The answer to your question is: K = 12

    Step-by-step explanation:

    Data

    f (x) = x³ - 5x² + kx - 3

    f (3) = -15, find k

    Process

    15 = (3) ³ - 5 (3) ² + k (3) - 3 Substitution

    15 = 27 - 45 + 3k - 3 Simplify

    15 = - 21 + 3k

    15 + 21 = 3k

    3k = 36

    k = 36 / 3

    k = 12 result
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