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29 April, 12:26

What is x² - 30x+81=0

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Answers (1)
  1. 29 April, 15:29
    0
    X² - 30x + 81 = 0

    x = - (-30) + / - √ ((-30) ² - 4 (1) (81))

    2 (1)

    x = 30 + / - √ (900 - 324)

    2

    x = 30 + / - √ (576)

    2

    x = 30 + / - 24

    2

    x = 15 + 12

    x = 15 + 12 x = 15 - 12

    x = 27 x = 3

    The solution to the problem is {27, 3}.
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