1. 3a+5b-4a-5b = 2. -2a-(-3b)-7a-4b = 3. -(2a+3)-2a+7 = 4. -3b-4a-5b-3a = 5. -2(3a-2b)-5ab = 6. (x+y) (x-y) = 7. (2x-3) (4x+5) = 8. (8x-4) (9y-7y) = 9. (3x+4) (

1.-1a
2.-9a-1b
3.2a+10

1.)3a-4a+5b-5b
=-a
2.)-2a-(-3b)-7a-4b
=-2a+3b-7a-4b
=-2a-7a+3b-4b
=-9a-b
3.)-(2a+3)-2a+7
= -2a-3-2a+7
=-4a+4
4.)-8b-7a
5.)-6a+4b-5ab
6.)x2-xy+xy-y2
=x2-y2
7.)(2x-3)(4x+5)
=8x2+10x-12x-15
=8x2-2x-15
8.)(8x-4) (9y-7y)
=72xy-56xy-36y+28y
=16xy-8y
9.)(3x+4)(3x+4)
=9x2+12x+12x+16
=9x2+24x+16
10.)(2a(3a+4b)-3a(2a-7b)
=6a2+8ab-6a2+21ab
=12a2+29ab