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21 February, 12:06

Which of the following are roots of the polynomial function below f (x) = 2x^3-x^2-9x+6

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  1. 21 February, 13:58
    0
    F (x) = 2x³ - x² - 9x + 6

    0 = 2x³ - x² - 9x + 6

    0 = 2x³ + 3x² - 4x² - 3x - 6x + 6

    0 = 2x³ + 3x² - 3x - 4x² - 6x + 6

    0 = x (2x²) + x (3x) - x (3) - 2 (2x²) - 2 (3x) + 2 (3)

    0 = x (2x² + 3x - 3) - 2 (2x² + 3x - 3)

    0 = (x - 2) (2x² + 3x - 3)

    0 = x - 2 or 0 = 2x² + 3x - 3

    + 2 + 2 x = - 3 ± √ (3) ² - 4 (2) (-3)

    2 = x 2 (2)

    x = - 3 ± √9 - 4 (-6)

    4

    x = - 3 ± √9 + 24

    4

    x = - 3 ± √33

    4

    x ≈ - 3 ± 5.74

    4

    x ≈ - 3 + 5.74 or x ≈ - 3 - 5.74

    4 4

    x ≈ 2.74 or x ≈ - 8.74

    4 4

    x ≈ 0.685 or x ≈ - 2.185
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