Match the polynomial on the left with the corresponding polynomial on the right.
Add: (-4x²-3x+6) + (6x² - 2x + 1)
Find the opposite of: 2x² + x-7
Subtract: (-4x²+2x-1)-(-2x² + 3x+6)
-2x²-x-7
-2x²-x+7
-2x² - 5x+7
2x²-x+7
2x²-5x+7