Simplify ( n+ m)² – ( n – m )²
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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.
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