Thread: f(x) g(x) help

Question
If f(x) = 4x - 12, and g(x) = x^2 + 12, what is f(g(x))?

Work Done
4(x^2 + 12) - 12
4x^2 + 48 - 12
4x^2 + 36

Is this coorect? I substituted g(x) in the f(x) equation when there was an x.

Originally Posted by Alan

Question
If f(x) = 4x - 12, and g(x) = x^2 + 12, what is f(g(x))?

Work Done
4(x^2 + 12) - 12
4x^2 + 48 - 12
4x^2 + 36

Is this coorect? I substituted g(x) in the f(x) equation when there was an x.

That's perfect, Well done.

Here is a harder question for you to try.

and

show that

Bobak

Thanks, I'll probably have some more questions soon. I am reviewing for an exam.