You can put this solution on YOUR website! Send me an email at justin.sheppard.tech@hotmail.com
I will help you with this problem. It is a composition of functions. You plug f(4) in for all x in the g(x) function. If I show you, it will make perfect sense. It is hard to understand this one without an explanation to introduce it.
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Justin
justin.sheppard.tech@hotmail.com