Adding and Subtracting Polynomials Perform the operations. 1. (12y? + 17y - 4) + (9y? - 13y + 3) = 2 . ( 2 x3 + 7 x2 + x) + ( 2x2 - 4x - 12) = 3 . (-3m? + m) + (4m? + 6m) = 4. (723 + 4z - 1) + (272 - 62 + 2) = 15. (3a2 + 2a - 2) - (a2 - 3a + 7) = 6. (5x2 - 2x - 1) - (3x2 - 5x + 7) = 7. - (372 + 42) - ( 672 - 2) = 8. (6x3 - 4x2 + x - 9) - (3x2 + 7x+ 3) = 9. (2x2 + 1) + (x2 - 2x + 1) = 10. (-$2 - 3) - (2s2 + 10s) = 11. (5 - 9a') + (4a2 + 6a - 3) = 12. (3x2 - x) + 5x3 + (-4x3 + x2 - 8) = 13. -10(u + v) + 8(u- 1) - 3(u + 6) = 14. 7x - [2( x2 - z) + 4x2 - 7z] + 62 = 15. Subtract t* - 3+ + 7 from 5+3 - 9. 16. Subtract y' - y* from y + 3y. 17. Add 4(m + 2) to 3m + 7m. 18. 3(x2 - 2x + 3) - 4(4x + 1) - (3x2 - 2x) = 19. (.5x2 + 4.25x -.9) - .5(x2 + 7x - 3) = 20. .23(4x2 + 9x - 4) +.9(.04x2 + 3x - 7) =