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Q.

If the quadratic equation x2+kx+9=0 has equal roots, then the value of ‘k’ is

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a

±3

b

Both A and B

c

−6

d

6

answer is D.

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Detailed Solution

x2+kx+9=0Δ=0b2−4ac=0k2−4.1.9=0k2−36=0⇒k=±6

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