How to solve this in short method?
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apply the identity
![{a}^{2} - {b}^{2} =( a + b)(a - b) {a}^{2} - {b}^{2} =( a + b)(a - b)](https://tex.z-dn.net/?f=+%7Ba%7D%5E%7B2%7D+++-+++%7Bb%7D%5E%7B2%7D++%3D%28+a+%2B+b%29%28a+-+b%29)
RahulBN:
please explain in detail
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