Question

Simplify ( n+ m)² – ( n – m )²​

Answer 1

Step-by-step explanation:

(n+m)^2 - (n-m)^2

= n^2 + 2nm + m^2 - n2 - 2nm + m^2

= n^2 - n^2 + 2nm + 2nm + m^2 - m^2

= 4nm.

Thanks.