3x^2y^2+10xy+5
=5x^2y^2+10xy+5-2x^2y^2
=5(xy+1)^2-2x^2y^2
=(√5xy+√5-√2xy)(√5xy+√5+√2xy)
=[(√5-√2)xy+√5][(√5+√2)xy+√5]