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11 April, 11:31

Solve n3 + 2n2 - 15n = 0 by factoring.

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Answers (2)
  1. 11 April, 13:27
    0
    N^3+2n^2-15n=0

    n (n^2+2n-15) = 0

    n (n^2+5n-3n-15) = 0

    n (n (n+5) - 3 (n+5)) = 0

    n (n-3) (n+5) = 0

    n={-5, 0, 3}
  2. 11 April, 13:27
    0
    N³ - 2n² - 15n = 0

    "n"

    n (n² + 2n - 15) = 0

    n = 0

    n² + 2n - 15 = 0

    Δ = (2) ² - 4 (1) (-15)

    Δ = 4 + 60 = 64

    n' = (-2+8) / 2 = 6/2 = 3

    n'' = (-2-8) / 2 = - 10/2 = - 5

    Solution:

    S {-5, 0, 3 }
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