Question 21916
121-64x^2-36y^2+96xy
=11*11-{(8X)^2+(6Y)^2-2*(8X)(6Y)}
=11^2-(8X-6Y)^2........................USING...(A-B)^2=A^2+B^2-2AB
(11+8X-6Y){11-(8X-6Y)}.................USING.... A^2-B^2=(A+B)(A-B)
(11+8X-6Y)(11-8X+6Y)