If \(a\) \(=40\) , \(b\) \(=70\) , \(m\) \(=\) 4, and \(n\) \(=\) 6, then evaluate the value of \(+\) using the identities.
Answer:
The product is expanded using the identity of \((a+m)(b-n)\) \(=\) .
The value of \(=\) .
The product is expanded using the identity of \((a-m)(b+n)\) \(=\) .
The value of \(=\) .
The value of \(+\) \(=\) .