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Find f(h(x))

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Awesome, thanks for posting an example.
So in this problem, we want to replace the x in f(x) with h(x).  That would give us f(12/x).  So in the function for f(x), where there is an x, we replace it with (12/x).
So, f(h(x)) becomes f(12/x) = (12/x)^2 + 7 = (144/x^2) + 7.
I hope that makes sense.