given the following functions f(x) and g(x) solve f[g(7)]
f(x) = 4x + 21
g(x) = 2x + 2
HELP IM SO CONFUSED I JUST NEED SOMEONE TO LAY IT ALL OUT

Question

given the following functions f(x) and g(x) solve f[g(7)] 
f(x) = 4x + 21 
g(x) = 2x + 2 
HELP IM SO CONFUSED I JUST NEED SOMEONE TO LAY IT ALL OUT

freckles · Answer

Do you know how to find g(7)?

anonymous · Answer

No I don't know how to do any of it @freckles I need someone to kinda lay the whole thing out to me

freckles · Answer

g(x)=2x+2
g(7) means we should replace x's with 7's
g(7)=2(7)+2

anonymous · Answer

Is it 85? Because g(7)=16. Plug in 16 for x in f which equals 85.

freckles · Answer

do you know how to simplify 2(7)+2?

anonymous · Answer

You should start with what is in the parenthesis which is g(7). For that you simply plug in 7 for x.

anonymous · Answer

85 is a choice.

anonymous · Answer

The answer is 85. Because after you get g(7)=16. you plug in 16 for x in f(g)

anonymous · Answer

16x4=64
64+21=85