Algebra functions

Question

f(x) = 2x^2 - 4, g(x)= 3x + 1, find (fg)(4)

Answer 1

I assume you mean f(g(4)). When evaluating one value, the easiest thing to do is to find

g(4) = 3(4) +1 = 13

f(g(4)) = f(13) = 2(13)²- 4 = 334

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