Question

Could someone help me with these? I thnk I'm missing a step

\[(3\sqrt{x+5})+2x ^{3}-6\]

\[(3\sqrt{x+5})-2x ^{3}-6\]

Answer 1

well, you could start with stating the problem. Is this a system of equations?

Answer 2

Functions. The origional statement is:
Given \[f(x)=3\sqrt{x+5} \]
and
\[g(x)=2x ^{3}-6\]

find (f+g)(4)

Answer 3

Well, (f+g) means that you just have to add those functions. (f+g)(4) means that you have to find the value of the sum at point x=4.
\[(f+g)(4)=3\sqrt{4+5}+2*4^3-6=3*3+128-6=9+122=131\]

Answer 4

Oh, I see. I was misreading it, adding the equations then trying to multiply by four

You put the 4 in first then add. Ok, that makes more sense

Answer 5

Thank you