Somebody help me please

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Solve the equation by completing the square. x^2+2x=17