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9 November, 16:17

Which is a zero of the quadratic function f (x) = 9x2 - 54x - 19?

x =

x = 3

x = 6

x = 9

+2
Answers (1)
  1. 9 November, 16:46
    0
    F (x) = 9x² - 54x - 19 = 9x² - 57x + 3x - 19 = 3x (3x - 19) + 1 (3x - 19)

    = (3x - 19) (3x + 1)

    f (x) = 0 if 3x - 19 = 0 or 3x + 1 = 0

    3x = 19 or 3x = - 1

    x = 19/3 or x = - 1/3
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