Question

(x3 + 3x2 + x + 1) + (2x3 - 2x2 - 2x + 2)

Answer 1

(x3 + 3x2 + x + 1) + (2x3 - 2x2 - 2x + 2)
2x3+x3+3x2-2x2+x-2x+1+2
3x3+x2-x+3

Answer 2

\[~~~~1x^3+3x^2+1x+1 \\
\underline{+~2x^3-2x^2-2x+2}\\
~~~~3x^3+1x^2-1x+3\]