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in Quadratic Equations by (31.2k points)
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Write the value of k for which the quadratic equation x2 – kx + 4 = 0 has equal roots.

1 Answer

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Best answer

Quadratic equation has equal roots then d = b2 – 4ac = 0

Here a = 1, b = k and c = 4

So b2 – 4ac = 0

⇒ k2 – 4 × 1 × 4 = 0

⇒ k2 – 16 = 0

⇒ k = \(\pm4\)

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