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4 November, 16:20

What value (s) of x make the equation x2 - 18x + 81 = 0 true?

9

-9, 9

0, 9

0, - 9, 9

+2
Answers (1)
  1. 4 November, 16:30
    0
    X^2 - 18x + 81 = 0

    x^2 - 9x - 9x + 81 = 0

    x (x - 9) - 9 (x - 9) = 0

    (x - 9) (x - 9) = 0

    (x - 9) ^2 = 0

    x - 9 = 0

    x = 9
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