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Question

Value of k for which the quadratic polynomial kx2+x+k has equal zeros.

A
±12
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B
±13
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C
±14
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D
±1
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Solution

The correct option is D ±12
For the equation kx2+x+k=0 to have equal zeros the discriminant must be zero.
Hence, 14k2=0

=>k2=14

k=±12

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