1.

यदि `x+1/(9x)=4` हो तो `9x^(2)+1/(9x^(2))` का मान क्या होगा?A. 140B. 142C. 144D. 146

Answer» Correct Answer - B
`x+1/(9x)=4`
Multiply by 3 both side
`3x+1/(3x)=12`
squaring both side
`9x^(2)+1/(9x^(2))+2xx3xx x1/(3x)=144`
`9x^(2)+1/(9x^(2))+2=144`
`9x^(2)+1/(9x^(2))=142`


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