How do I find (a) f*g (b) g*f (c) f*f of these problems?

Question

If you can, please show me step by step ^___^ thank you

1)f(x)=x^2
2) f(x)=3x+5

Answer 1

I assume you mean g(x) = 3x+5

(f*g)(x) = f(x)*g(x) = (x^2)*(3x+2) = 3x^3 + 2x^2
similarly for g*f and f*f