16 - 5x2 - 3
= -5x2 + 15x + x - 3
= -5x(x - 3) + (x - 3)
= (1 - 5x)(x - 3)
16x-5x^2-3=-5x^2+15x+x-3=5x(3-x)-(3-x) =(3-x)(5x-1) (xy+1)^2-x^2-2xy-y^2=(xy+1)^2-(x^2+2xy+y^2) =(xy+1)^2-(x+y)^2 =(xy+1-x-y)(xy+1+x+y) =[(xy-x)-(y-1)][(xy+x)+(y+1)] =[x(y-1)-(y-1)][x(y+1)+(y+1)] =(y-1)(x-1)(y+1)(x+1)