(x+5)(x+6)=
(y+1)(y+9)=
. (y+6) (y+14)=
(x+8)(x-1)=
(y+7)(y-3)=
(b+11)(b+5)=
. (x-9)(x+3)=.
(y-7)(y-1)=
(3x+6)(3x+2)=.​