What is the rule for (fg)(x) for functions f(x)=x^2-9 and g(x)=2x
2x²-7x

2x^3+

2x^3 +2x-9

2x^3-18x

what is the rule for (fg)(x) for functions f(x)=2x^2-8 and g(x)=x+2
3x-6

3x²-10

2x²-x-10

x-10