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The complete set of values of `k ,` for which the quadratic `x^2-k x+k+2=0` has equal roots, consists of `2+sqrt(12)` (b) `2+-sqrt(12)` (c) `2-sqrt(12)` (d) `-2-sqrt(12)`

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Given, `x^2−kx+k+2=0 `has equal roots.
So, Discriminant = D=0⟹`k^2−4(k+2)=0`
⟹`k^2−4k−8=0⟹k=2+-sqrt(12)`
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