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4 December, 03:42

N Squared - N = 90

N = ?

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Answers (1)
  1. 4 December, 04:57
    0
    N^2 - n = 90

    n^2 - n - 90 = 0

    (n - 10) (n + 9) = 0

    n - 10 = 0

    n = 10

    n + 9 = 0

    n = - 9

    answer is : n = 10 and n = - 9
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