1.

यदि `(sqrt(x+4)-sqrt(x-4))/(sqrt(x+4)-sqrt(x-4))=2` तो `x` किसके बराबर है?A. 2.4B. 3.2C. 4D. 5

Answer» Correct Answer - D
`(sqrt(x+4)+sqrt(x-4))/(sqrt(x+4)-sqrt(x-4))=2/1`
By C-D rule
`(sqrt(x+4))/(sqrt(x-4))=(2+1)/(2-1)=3/1`
`implies((sqrt(x+4))/(sqrt(x-4)))^(2)=(3/1)^(2)`
`implies (x+4)/(x-4)=` 9again C & D rule
`implies x/4=(9+1)/(9-1)`
`impliesx/4=10/8`
`implies x=10/8xx4=5`


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