1.

यदि `a^(2)-4a-1=0` है तो `a^(2)+1/(a^(2))+3a-3/a` का मान क्या होगा?A. 25B. 30C. 35D. 40

Answer» Correct Answer - B
`a^(2)-4a-1=0`
`a^(2)-1=4a`
`a-1/a=4`
Squaring both sides
`a^(2)+1/(a^(2))-2=16`
`a^(2)+1/(a^(2))=18`
`:. a^(2)+1/(a^(2))+3(a-1/a)`
`=18+3xx4=18+12=30`


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