ab+ac-a=a(b+c-1)
4x^2 -y^2+2x-y=(4x^2-y^2)+(2x-y)=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y+1)
1) ab+ac-a=a(b+c-1)
2)
ab+ac-a=a(b+c-1)
4x^2 -y^2+2x-y=(4x^2-y^2)+(2x-y)=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y+1)
1) ab+ac-a=a(b+c-1)
2)