Simplify each of the given expression.show your solutions.

Answer:
1) -x-9
2)2x²-3
3)8x-xy-2y²
Step-by-step explanation:
1) (3x-7) +(-4x-2)
(3x-4x)(-7-2)
-x-9
2) (-3x²-2x+5) + (5x²+2x-8)
(-3x+5x²)(-2x+2x(5-8)
2x²-3
3) (3x²-7xy+2y²)(5x²+6xy-4y²)
(3x²+5x²)(-7xy+6xy)(2y²-4y²)
8x²-xy-2y²