Let's first understand what the question is asking us to do. It's asking us to first multiply the two functions f(x) and g(x). That's all we have to do for this. Let's do it!:
[tex](4x+1)(x^2-5) = 4x^3-20x+x^2-5[/tex]
So, your answer (rearranged) is:
[tex]4x^3+x^2-20x-5[/tex]
