1.

`(sqrt(3+x)+sqrt(3-x))/(sqrt(3+x)-sqrt(3-x))=2` तो `x` का मान क्या होगा?A. `5/12`B. `12/5`C. `5/7`D. `7/5`

Answer» Correct Answer - B
`(sqrt(3+x)+sqrt(3-x))/(sqrt(3+x)-sqrt(3-x))=2/1`
(by c-d rule)
`implies(sqrt(3+x))/(sqrt(3-x))=(2+1)/(2-1)=3/1`
`((A/B=C/D),((A+B)/(A-B)=(C+D)/(C-D)))`
`(sqrt(3+x))/(sqrt(3-x))=3`
Squaring both sides
`(3+x)/(3-x)=9`
`3+x=27-9x`
`10x=24`
`x=24/10=12/5`


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