railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Mathematics Quadratic Equations

If x2 + kx + k = 0 has repeated roots, then the value of k will satisfy:

1
k < 0 or k > 4
2
k = 4 only
3
k = 4 or k = 0
4
0 < k < 4
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