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For what value of k are the roots of the...

For what value of k are the roots of the quadratic equation `kx(x-2sqrt(5))+10=0` real and equal?

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The correct Answer is:
`k=0" or 'k=2`
Given equation is `kx^(2)-2sqrt(5)kx+10=0.`
`:." "D=20k^(2)-40k=20k(k-2).`
For real and equal roots, we must have D=0.
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