Here is how you are going to add the given polynomials: 3x^4 - 2x^3 -11 12x^4 +x^2 +1 <<< Add these using the normal addition process ---------------------------------- 15x^4 - 2x^3 +x^2 -10 Therefore, the answer would be the last option: 15x4 – 2x3 + x2 – 10 Hope this is the answer that you are looking for. Thanks for posting!