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23 May, 19:09

F (x) = 4x^2-27x+18 quadratic function using a table

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  1. 23 May, 21:25
    0
    F (x) = 4x² - 27x + 18

    4x² - 27x + 18 = 0

    x = - (-27) + / - √ ((-27) ² - 4 (4) (18))

    2 (4)

    x = 27 + / - √ (729 - 288)

    8

    x = 27 + / - √ (441)

    8

    x = 27 + / - 21

    8

    x = 3³/₈ + 2⁵/₈

    x = 3³/₈ + 2⁵/₈ x = 3³/₈ - 2⁵/₈

    x = 6 x = ³/₄

    f (x) = 4x² - 27x + 18

    f (6) = 4 (6) ² - 27 (6) + 18

    f (6) = 4 (36) - 162 + 18

    f (6) = 144 - 162 + 18

    f (6) = - 18 + 18

    f (6) = 0

    (x, f (x)) = (6, 0)

    or

    f (x) = 4x² - 27x + 18

    f (³/₄) = 4 (³/₄) ² - 27 (³/₄) + 18

    f (³/₄) = 4 (⁹/₁₆) - 20¹/₄ + 18

    f (³/₄) = 2¹/₄ - 20¹/₄ + 18

    f (³/₄) = - 18 + 18

    f (³/₄) = 0

    (x, f (x)) = (³/₄, 0)
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