What is the value of f[g(5)] for the functions f(x) = 2x + 1 and g(x) = 2x - 5. please help i have no idea what this means!!

Question

ash2326 · Answer

We have 
$$ f(x)=2x+1$$
and 
$$g(x)= 2x-5$$
We need to find f[g(5)] 
Let's find f[g(x)] first
$$f(x)= 2x+1$$
to find f[g(x)] substitute x = g(x) in f(x)
we get 
$$f[g(x)]= 2g(x)+1$$
now g(x)= 2x-5
so substituting value of g(x)
$$f[g(x)]= 2(2x-5)+1$$
Let's simplify
$$f[g(x)]=4x-10+1=4x-9$$
so
$$f[g(x)]=4x-9$$
We need to find f[g(5)], so substitute x=5 in f[g(x)]
$$f[g(5)]= 4 (5)-9$$
Can you solve the rest???

anonymous · Answer

I have no idea what you just did.....i just need the answer....but when i get the answer it comes out two.

ash2326 · Answer

What didn't you get??