InterviewSolution
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InterviewSolution
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If `x ,y ,z`are different from zero and `"Delta"=a b-y c-z a-x b c-z a-x b-y c=0,`then the value of the expression `a/x+b/y+c/z`is`0`b. `-1`c. `1`d. `2` |
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Answer» Correct Answer - D Applying `R_(2) to R_(2)-R_(1),R_(3) to R_(3) -R_(1)` we get `Delta = |{:(a,,b-y,,c-z),(-x,,y,,0),(-x,,0,,z:}|=0` Expanding along `C_(3) ` we get `" or " (c-z)(xy)+z(ay+bx-xy)=0` `" or " cxy -xyz +ayz +bxz -xyz =0` `" or " ayz +bzx + cxz =2xyz` `" or " (a)/(x)+(b)/(y)+(c )/(z)=2` |
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