2x2+8x+3x+12
(2x+3)(x+4)
xy-ty-xs-ts
(x-t)(y+s)
2wz+6w-5z-15
(z+3)(2w-5)
3x2+6x+4x+8
(x+2)(3x+4)
x2+10x+25-16y2
grouping
perfect square
difference of squares
[(x+5) -4y][(x+5) +4y]