Question

​I will mark as brain list

Answer 1

Proof :

L.H.S. = (x + 1/x)² - 4

= {x² + (2 * x * 1/x) + 1/x²} - 4

= x² + 2 + 1/x² - 4

= x² - 2 + 1/x²

= x² - (2 * x * 1/x) + 1/x²

= (x - 1/x)² = R.H.S.

Hence, proved.

Identity Rules :

• (a + b)² = a² + 2ab + b²

• (a - b)² = a² - 2ab + b²

Answer 2

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