Please help me on this question. I Need to get this done in order to get my grade lifted up

Question

If (f+g)(x)=7x^2−11x+3,which of these could be f(x) and g(x)?

1. f(x)=−x^3+x^2+3; g(x)=x^3+6x^2−11x
2. f(x)=−8x+1; g(x)=7x^2−3x+3
3. f(x)=x^3+7x^2−2x; g(x)=−9x+3
4. f(x)=3x^2−6x−4; g(x)=4x^2−5x+1

Answer 1

Number 1 is the correct answr

Number 4 is close, but has a sign wrong on the constant term

Number 2 is close but the constant term is one digit off

Number 3 is close, except it has that extra cubic term

just add f(x) and g(x) in each answer and see if they fit (f+g)(x) = 7x^2 -11x + 3

Number 2 sums to 7x^2 -11x +4, which has a 4 instead of 3 for the constant term

Number 3 sums to x^3 + 7x^2 -11x + 3 which is correct except for the extra x^3 term

Number 4 sums to 7x^2 -11x -3 which is correct except for the sign on the constant term. -3 doesn't match +3