1: =(a-b)(x+1)
2: =(a+b)(x+1)
3: =(x+y)(m+1)
4: =(x-y)(m+1)
8: =(a-b)(1+x)
11: =(a+b)(x-1)
13: =(x+y)(a-1)
12: =(x-y)(a-1)
14: =(a-b)(x-1)
16: =(x+y)(a+b)
17: =(x+y)(a+2)
1) x(a-b) + a-b
=x(a-b)+(a-b)
=(a-b)(x+1)
10) a-b-x(b-a)
=(a-b)-x(b-a)
=(a-b)+x(a-b)
=(a-b)(x+1)
12) a(x-y) -x+y
=a(x-y)-(x-y)
=(x-y)(a-1)
17) ax+ay+2x+2y
=(ax+2x)+(ay+2y)
=x(a+2) + y(a+2)
=(a+2)(x+y)
18) ax+ay-bx-by
=(ax-bx) + (ay-by)
=x(a-b) + y(a-b)
=(a-b)(x+y)
25) 10ax-5ay-2x+y
=(10ax-2x) - (5ay-y)
=2x(5a-1) - y(5a-1)
=(5a-1)(2x-y)
28) \(2x^2\) -6xy+5x-15y
=(\(2x^2\)-6xy) +(5x-15y)
=2x(x-3y) + 5( x-3y)
=(x-3y)(2x+5)
31) \(2a^2x-5by-5a^2y+2bx\)
=(\(2a^2x-5a^2y\) ) + (2bx-5by)
=\(a^2\) (2x-5y) + b(2x-5y)
=(2x-5y)(\(a^2\) +b)