A) \[[-2,2]\]
B) \[[-\infty ,-2]\cup [2,\infty ]\]
C) \[[-3,3]\]
D) \[[-\infty ,-3]\cup [3,\infty ]\]
Correct Answer: A
Solution :
(a): Discriminant \[\ge 0\Rightarrow 4{{k}^{2}}-4{{k}^{2}}+12\ge 0\Rightarrow {{k}^{2}}-4\le 0\]You need to login to perform this action.
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