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24 January, 16:14

F (x) = 3x2 - 5x - 9

g (x) = 3x - 8

Find: f (g (x))

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Answers (1)
  1. 24 January, 19:12
    0
    27x^2 - 159x + 223

    Step-by-step explanation:

    We replace the x in f (x) by g (x):

    f (g (x)) = 3 (3x - 8) ^2 - 5 (3x - 8) - 9

    = 3 (9x^2 - 48x + 64) - 15x + 40 - 9

    = 27x^2 - 144x + 192 - 15x + 31

    = 27x^2 - 159x + 223.
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