We need to find (f+g))(x)=7x²−11x+3.
Hence, we need to find two equations that add up to the given result.
The first term is 7x²
The second term is −11x
The third term is 3
Hence, the correct answer is the last option because:
f(x)= -x³+x²+3
g(x)=x³+6x²-11x
-x³+x³=0
x²+6x²=7x²
3
-11x