Math (Composite Functions)

I don't understand this question at all.

If f(x) = 4x - 3 and h(x) = 4x^2 - 21, find a function g such that f ͦ g = h.

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asked by Lucy
  1. Ask yourself what function results in 4x^2 -21 when you multiply it by 4 and subtract 3 (the f(x) operation).

    4 g(x) -3 = 4x^2 -21
    4 g(x) = 4x^2 -18
    g(x) = x^2 - 18/4

    That is the answer

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    posted by drwls

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