InterviewSolution
Saved Bookmarks
| 1. |
यदि `x+y=4, x^(2)+y^(2)=14` और `xgty`, तो `x` और `y` का सही मान क्या होगा?A. `2-sqrt(2),sqrt(3)`B. `3,1`C. `2+sqrt(3),2-sqrt(3)`D. `2+sqrt(3),2sqrt(2)` |
|
Answer» Correct Answer - C `x^(2)+y^(2)=14` `x+y=4`…………..i Squaring both sides `x^(2)+y^(2)+2xy=16` `14+2xy=16` `2xy=2` `xy=1` `x^(2)+y^(2)=14` Substracting `(2xy)` from both sides `x^(2)+y^(2)-2xy=14-2xy` `(x-y)^(2)=14-2xx1` `x=y=sqrt(12)` `x-y=2sqrt(3)`..............ii `y=2-sqrt(3)` `x=2+sqrt(3)` |
|