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If the roots of equation x2 - 6x + k = 0 are real and distinct, then value of k is :
> -9
> -6
< 6
< 9
The roots of the quadratic equation px2 - qx + r = 0 are real and equal if :
(a) p2 = 4qr
(b) q2 = 4pr
(c) –q2 = 4pr
(d) p2 > 4qr