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प्रश्न
The complete set of values of k, for which the quadratic equation \[x^2 - kx + k + 2 = 0\] has equal roots, consists of
पर्याय
\[2 + \sqrt{12}\]
\[2 \pm \sqrt{12}\]
\[2 - \sqrt{12}\]
\[- 2 - \sqrt{12}\]
उत्तर
\[2 \pm \sqrt{12}\]
\[\text { Since the equation has real roots } . \]
\[ \Rightarrow D = 0\]
\[ \Rightarrow b^2 - 4ac = 0\]
\[ \Rightarrow k^2 - 4\left( 1 \right)\left( k + 2 \right) = 0\]
\[ \Rightarrow k^2 - 4k - 8 = 0\]
\[ \Rightarrow k = \frac{4 \pm \sqrt{16 - 4\left( 1 \right)\left( - 8 \right)}}{2\left( 1 \right)}\]
\[ \Rightarrow k = \frac{4 \pm 2\sqrt{12}}{2}\]
\[ \Rightarrow k = 2 \pm \sqrt{12}\]
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