Given:( m2 – n2) (m2 + n2),it is a product of 2 binomial expressions which have the terms (m2 – n2) and (m2 + n2).
Now when we compare these expressions with the identities, we
find it in the form of (a-b)(a + b),where a = m2 and b = n2,
The identity (a-b)(a + b) = a2-b2,
Hence, (m2 – n2) (m2 + n2) = (m2)2-(n2)2 = m4-n4
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