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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 |
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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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