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28 March, 18:24

Which is a zero of quadratic function f (x) = 9x^2-54x-19?

X = 1/3

X = 3 1/3

X = 6 1/3

X = 9 1/3

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Answers (1)
  1. 28 March, 21:20
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    9x^2 - 54x - 19

    = 9x^2 + 3x - 57x - 19

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

    = (3x - 19) (3x + 1) = 0

    x = - 1/3, 19/3 ( = 6 1/3)

    Answer is choice 3: - 6 1/3
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