1.

`2x+2/(9x)=4` तो `27x^(3)+1/(27x^(3))` का मान क्या है?A. 180B. 198C. 234D. 252

Answer» Correct Answer - B
`2x+2/(9x)=4`
Multiply by `3/2` on both sides
`3x+1/(3x)=6`
Taking cube on both sides
`(3x+1/(3x))^(2)=(6)^(3)`
`27x^(3)+1/(27x^(3))+3xx3x xx 1/(3x)`
`(3x+1/(3x))=216`
`27x^(3)+1/(27x^(3))+3xx6=216`
`27x^(3)+1/(27x^(3))`
`=216-18=198`


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