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Here, a = 1, b = k and c = 9 For equal roots D = 0 ⇒ b 2 – 4ac = 0 ⇒ (–k) 2 – 4(1) (9) = 0 ⇒ k 2 – 36 = 0 ⇒ k = ± 6.

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Here, a = 1,
b = k and c = 9
For equal roots D = 0
⇒ b² – 4ac = 0
⇒ (–k)² – 4(1) (9) = 0
⇒ k² – 36 = 0
⇒ k = ± 6.

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