1)ax²-bx²-bx+ax-a+b= 2)ax²+bx-bx-ax+a+b= 1)ac²-ad+c³-cd-bc²+bd= 3)x²-8x+15= 4)x²-7x+12= 25

1) ах^2+ах-а-bx^2-bx-b = a(x^2+x-1)-b(x^2-x-1) = (a-b)(x^2+x-1)
2) ax^2+bx^2-bx-ax+a+b = a(x^2-x+1)+b(x^2-x+1) = (a+b)(x^2-x+1)
3)x^2-8x+15 = x(x-8)+15
4)x^2-7x+12 = x(x-7)+12