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Find the values of k for which the given...

Find the values of k for which the given quadratic equation has real and distinct roots:
(i)` kx^(2)+6x+1=0" "(ii)" "x^(2)-kx+9=0`
(iii)` 9x^(2)+3kx+4=0" "(iv)" "5x^(2)-kx+1=0`

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