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`(13+2sqrt(5))^(2)=?sqrt(5)+189`A. 26B. 25C. 52D. 130

Answer» Correct Answer - C
`(13+2sqrt(5))^(2)=?xxsqrt(5)+189`
`rArr 169+20+2xx13xx2sqrt(5)=?xxsqrt(5)+189`
`189+52xxsqrt(5)=?xxsqrt(5)+189`
`rArr ?=52`


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