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7 March, 17:24

Nine times a certain number is 5 less than twice the square of the number

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Answers (2)
  1. 7 March, 17:42
    0
    -1/2 or 5

    Step-by-step explanation:

    9n = (2 * n^2) - 5 = > n = - 0.5 and n = 5
  2. 7 March, 19:22
    0
    Step-by-step explanation:

    9·x = 2·x^2 - 5

    2·x^2 - 9·x - 5 = 0

    x^2 - 9/2·x - 5/2 = 0

    x = 9/4 ± √ (81/16 + 40/16) = 9/4 ± √ (121/16) = 9/4 ± 11/4

    x1 = - 1/2 = - 0.5 or x2 = 5
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