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28 August, 09:22

Solve by completing the square, x^2+3x-9=0

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Answers (1)
  1. 28 August, 12:15
    0
    X² + 3x - 9 = 0

    x² + 3x + (-9) = 0

    x = - 1 + / - √3² - 4 (1) (-9)

    2 (1)

    x = - 1 + / - √9 + 36

    2

    x = - 1 + / - √45

    2

    x = - 1 + / - √ (9 * 5)

    2

    x = - 1 + / - √9 √5

    2

    x = - 1 + / - 3√5

    2

    x = - 1 + / - 3 (2.236067978)

    2

    x = - 1 + / - 6.70820393

    2

    x = - 1 + 6.70820393 x = - 1 - 6.70820393

    2 2

    x = 5.70820393 x = - 7.70820393

    2 2

    x = 2.854101965 x = - 3.854101965
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