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If the equation x^(4) + 4x^(3) - 2x^(2) ...

If the equation `x^(4) + 4x^(3) - 2x^(2) - 12 x + k = 0` has 4 real roots, then find set of values of k.

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The correct Answer is:
`-7 lt k lt 9 rArr k in (-7, 9)`
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