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If x-1/x=9, find x+1/xdot...

If `x-1/x=9,` find `x+1/xdot`

Text Solution

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Given:
`=> x-1/x=9`
Squaring both side, we get
`=> (x- 1/x)^2=(9)^2`
Using identity (a - b)² = a² + b² - 2ab
`=>( x^2+1/x)^2-2xxx1/x=81`
`=> x^2+(1/x)^2-2=81`
`=> x^2+(1/x)^2=81+2`
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