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 Sep 18, 2022
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If $x^{4}-3x^{2}-4=0$ then its roots are
Difficulty: Easy
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A: 

$2,-2,i$ and $-i$

B: 

$1,-1,i$ and $-i$

C: 

$i$

D: 

None of these

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NETNUST Entry TestMathematicsQuadratic Equations