If the parabola y = (1-k) x ^ 2-2x-1 has two intersections with the X axis, then the value range of K is the same RT

If f (x) has two intersections with X axis, the discriminant of F (x) should be greater than 0
Discriminant = 4 + 4 (1-k) = - 4K + 8 > 0
The solution is K

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