49(a-b) -16(a+b)
=[7(a-b)+4(a+b)][7(a-b)-4(a+b)]
=(11a-3b)(3a-11b)
(2x+y) - (x+2y)
=(2x+y-x-2y)(2x+y+x+2y)
=(x-y)(3x+3y)
=3(x-y)(x+y)
(x+y) -xy
=(x+y+xy)(x+y-xy)
3ax-3ay
=3a(x-y)
=3a(x-y)(x+y)
P-1
=(P-1)(P+1)
=(P-1)(P+1)(P+1)
49(a-b) -16(a+b)
=[7(a-b)+4(a+b)][7(a-b)-4(a+b)]
=(11a-3b)(3a-11b)
(2x+y) - (x+2y)
=(2x+y-x-2y)(2x+y+x+2y)
=(x-y)(3x+3y)
=3(x-y)(x+y)
(x+y) -xy
=(x+y+xy)(x+y-xy)
3ax-3ay
=3a(x-y)
=3a(x-y)(x+y)
P-1
=(P-1)(P+1)
=(P-1)(P+1)(P+1)