fg(x) = 3(x^2 + 3x) - 4
= 3x^2 + 9x - 4
Answer:
3x^2 +9x -4
Explanation:
f(x) = 3x-4
g(x) = x^2 +3x
f(g(x))
Substitute g(x) in for x in the function f(x)
f(g(x) = 3 (g(x)) -4
= 3( x^2 +3x) -4
= 3x^2 +9x -4
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