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2) 2-3a²-(a²-2a) = 2-3a²-a²+2a = -4a²+2a+2
3) (x-y)(2x+3y) = 2x²+3xy-2xy-3y² = 2x²+xy-3y²
4) 2(x-3y+xy)-2xy+3x = 2x-6y+2xy-2xy+3x = 5x-6y
5) (x+5)/(x-2) + (x-2)/(x+5) = (x+5)²+(x-2)² / (x-2)(x+5)
= x²+10x+25+x²-4x+4 / x²+3x-10
= 2x²+6x+29 / x²+3x-10
6) (4-9a²)/2+3a = (2-3a)(2+3a) / 2+3a = 2-3a
7) 4x²-4x+1 / 4x²-1 = (2x-1)(2x-1) / (2x+1)(2x-1) = 2x-1 / 2x+1
8) 25a²-16b² = (5a-4b)(5a+4b)
9) x²-19x-20 = (x-20)(x+1)
10) 4x²+14x-18 = (2x-2)(2x+9)