1.

यदि `x=3+sqrt(8)` है तो `x^(2)+1/(x^(2))` किसके बराबर होगा?A. 38B. 36C. 34D. 30

Answer» Correct Answer - C
`x=3+sqrt(8)`
`x^(2)=9+8+2xx3sqrt(8)`
`x^(2)=17+6sqrt(8)`
`1/(x^(2))=17-6sqrt(8)`
`x^(2)+1/(x^(2))=17+6sqrt(8)+17-6sqrt(8)=34`


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