Answer:
3x^2-13x
Step-by-step explanation:
What they mean by (f-g)(x) is they want you to minus g from f.
So what you do is you just minus them.
-3x-(-3x^2+10x). You will take the minus sign and distribute it to the -3x^2+10x.
-3x+3x^2-10x. You will then add -3x+-10x together because they are the same to get -13x.
3x^2-13x is your answer.
