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16 December, 20:07

1. 3x²=5

2. x²-18x=9

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Answers (1)
  1. 16 December, 20:09
    0
    3x² = 5

    3 3

    x² = 1²/₃

    x ≈ 1.2909

    x² - 18x = 9

    x² - 18x - 9 = 0

    x = - (-18) + / - √ ((-18) ² - 4 (1) (-9))

    2 (1)

    x = 18 + / - √ (324 + 36)

    2

    x = 18 + / - √ (360)

    2

    x = 18 + / - 6√ (10)

    2

    x = 9 + 3√ (10)

    x = 9 + 3√ (10) x = 9 - 3√ (10)
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