(C+2)(c-3)=
(2a-1)(3a+4)=
(5x-2y)(4x-y)=
(A-2)(a^-3a+6)=
(2x-1)^=
(3a+c)^=
(y-5)(y+5)

1. C2²-3c+2c-6=c2²-c-62. (2a-1)(3a+4)=6а^2+8a-3a-4=6a^2+5a-43. (5x-2y)(4x-y)=20x²-5xy-8xy+2y²=20x²+(-5xy-8xy)+2y²=20x²-13xy=2y²4. а^3-3a^2+6a-2a^2+6a-12= a^3-5a^2+12a-125. (2x-1)²=(2x)²-2*2x*1+1²6. (3а+c)²=(3d)²+2*3ac+c²=9a²+6ac+c²7. (y-5)(y+5)= y²-5²=y-25