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9-45.
  1. Given f(x) = 10x2 and g(x) = 15 − 3x, find the following: Homework Help ✎

    1. f(3 + h) − 90

    2. f(x + h) − 10x2

    3. g(20 + h)

    4. f(g(x))

Substitute
(3 + h) for every 'x' in the 'f' function. Simplify.

20xh + 10h2

Substitute (20+h) for every 'x' in the 'g' function. Simplify.

Substitute
(15 − 3x) for every 'x' in the 'f' function. Simplify.

2250 − 900x + 90x2