PLEASE HELP : If f(x) = 5x – 4 and g(x) = 6x + 3, what is f(g(x)) ?

Question

anonymous · Answer

substitute g(x) for x in f(x)
$$f(g(x))=5(6x+3)-4$$
simplify, why do you disappear immediately after you post a question

anonymous · Answer

i dont disappear ?

anonymous · Answer

and im still a bit lost

anonymous · Answer

$$f(g(x))=f(6x+3) = 5(6x+3)-4$$

anonymous · Answer

they want you to use the output of g(x) as the input for f(x)

anonymous · Answer

start with 
$$f(g(x))$$ replace
$$g(x)$$ by 
$$6x+3$$ then where youi see and 'x" in
$$f(x)$$ replace it by 
$$ 6x+3$$

anonymous · Answer

f(x) = 5x - 4

So, look at that x

Now, g(x) = 6x + 3

f( g(x) )

g(x) function goes in place of "x" in f(x) = 5x-4

Thus, 

f( g(x) ) = 5 (6x+3) - 4

And as you solve, 

f( g(x) ) = 60x + 15 - 4 = 60x + 11

anonymous · Answer

yeah but my answer choices are 		30x – 21
		30x – 1
		30x + 11
		30x + 12

anonymous · Answer

lol my bad i multiplied it wrong. it's 30x + 11

anonymous · Answer

okay thank you (: