Transcript text: Match the polynomial on the left with the corresponding polynomial on the right.
Add: $\left(-4 x^{2}-3 x+6\right)+\left(6 x^{2}-2 x+1\right)$
Find the opposite of: $2 x^{2}+x-7$
Subtract: $\left(-4 x^{2}+2 x-1\right)-\left(-2 x^{2}+3 x+6\right)$.
\[
\begin{array}{l}
-2 x^{2}-x-7 \\
-2 x^{2}-x+7 \\
-2 x^{2}-5 x+7 \\
2 x^{2}-x+7 \\
2 x^{2}-5 x+7
\end{array}
\]