Q.9. Find the value of k for which the equation has real and equal roots.
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/for-what-values-of-k-the-equation-x2-k4x-k-1-2-0-has/quadratic-equations/9795807
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https://www.meritnation.com/ask-answer/question/for-what-values-of-k-the-equation-x2-k4x-k-1-2-0-has/quadratic-equations/9795807
Regards