If $K x^{2} - K x + 1 = 0$ has equal roots then $K = ?$

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Solution

The correct option is D 4
Given $K x^{2} - K x + 1 = 0$ has equal roots
$⟹$ Discriminant $= 0$
$⟹ (- K)^{2} - 4 (K) (1) = 0 ⟹ K^{2} - 4 K = 0 ⟹ K = 0, 4$
$⟹ K = 4$

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