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1. (2x2 - 3x + 2) + (x2-x-1)
2. (4x2 + 5x -- 4) + (x2 - 3x + 2)
3. (3x3 + x2-1) + (-2+x2 + 5)
4. (x - 5) + (2x - 1) + 3x
5. (10x + 12y) + (3x - 12y)
6. (2x + 3) - (4x + 1)
7. (7x2 - 4xy + 8) -(3x2 + xy - 5)
8. (3x2-x-1)-(2x2 + 5x - 3)
9. (7x3 + 2x - 3) - (4x* - *? + 1)
10. (8x - y) - (7x + y) + 3x
plssss answer ASAP​