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If the equation x^2-ax+a+2=0 has equal ...

If the equation `x^2-ax+a+2=0` has equal roots then 'a' will be :

A

`2+sqrt12`

B

`2,-2`

C

`2-sqrt12`

D

`2+sqrt12, 2-sqrt12`

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The correct Answer is:
D
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