Hi There!
-2x-5y- 6x+4y (−8x − y)
-5a-3b+8a-b (3a − 4b)
7x^3+ 4y^2-9x^3-3y^2 (−2x^3 + y^2)
16x^4-19x^4-8y^3-7x^4 (−10x^4 − 8y^3)
(-4x^2+3y-8)+(-5y-2x^2+1) (−6x^2 − 2y − 7)
(-3a^3+ 7b ^2)-(-6a^3+9b^2) (3a^3 − 2b^2)
(5-p^2-4q)-(-2-q-3p^2) (2p^2 − 3q + 7)
-3(4h^5-k^4)=(5k^5+2k^4) (Can't Simplify)
-(9w^3-2z+3)+4(3w^3-z) (3w^3 − 2z − 3)
-6(w^3-3z+4)-2(7z-5w^3) (4w^3 + 4z − 24)
Hope This Helps :)