I am teaching my self algebra using khan academy and Ive come across a problem I cant figure out. I am trying to solve composite functions and I cant figure out why a Plus sign is added to the equation, Could I be missing something that I am suppose to distrubute?
The functions is:
g(−1)=(−1)^3+2(−1)^2 + (−7)(−1)+5+f(−1)
where does this............Δ Plus sign come from?