Factorise the following expression: l+m2-4lm
Factorise the given expression:
The given expression is,
l+m2-4lm=l2+m2+2lm-4lm. ∵a+b2=a2+b2+2ab
=l2+m2-2lm
=l-m2 ∵a-b2=a2+b2-2ab
Hence, the factors are l-m and.l-m.
Factorise: (l+m)2−4lm