1.

If the roots of `5x^(2)-kx+1=0` are real and distinct thenA. `-2sqrt(5)ltklt2sqrt(5)`B. `kgt2sqrt(5)` onlyC. `klt-2sqrt(5)` onlyD. either `kgt2sqrt(5)" or "klt-2sqrt(5)`

Answer» Correct Answer - D
The roots of `5x^(2)-kx+1=0` are real and distinct.
`:." "(k^(2)-4xx5xx1)ge0impliesk^(2)ge20implieskgesqrt(20)" or "klt-sqrt(20)`
`implieskgt2sqrt(5)" or "klt-2sqrt(5).`


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