To find f(g(x)), we have to substitute the formula for g(x) as the input for f(x).
f( g(x) ) = f( x+7 )
= 2 (x+7) - 3
= 2x + 14 - 3
= 2x + 11
The key is to substitute the entire formula for g(x) in as the input for f.
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