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If both the roots of a quadratic equatio...

If both the roots of a quadratic equation are coincident, which one of the following is not correct?

A

`x^2-2sqrt(c)x+c=0`

B

`x^2+2kx+k^2=0`

C

`x^2-2bx-b^2=0`

D

`x^2-2kx+k^2=0`

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