2. Rewrite each expression by determining the sum or difference. Show your work.
a. (4x3 - 6x - 8) + (2x - 9)
b. (3x2 + 6x - 3) - (3x2 + 3х - 3)
c. (5x2 + 3x - 10) + (4x -7)
d. (7x5 - 4x) - (2x3 + 4x - 8)
a. (4x^3 - 6x - 8) + (2x - 9)
= 4x^3 - 6x - 8 + 2x - 9
= 4x^3 - 4x - 17
b. (3x^2 + 6x - 3) - (3x^2 + 3x - 3)
= 3x^2 + 6x - 3 - 3x^2 - 3x + 3
= 3x - 3
c. (5x^2 + 3x - 10) + (4x - 7)
= 5x^2 + 3x - 10 + 4x - 7
= 5x^2 + 7x - 17
d. (7x^5 - 4x) - (2x^3 + 4x - 8)
= 7x^5 - 4x - 2x^3 - 4x + 8
= 7x^5 - 2x^3 - 8