If the expression x2+ x2-i x 1+2i x2 is real then the set of all possible value of x is

JEE Main Mathematics question

If the expression is real then the set of all possible value of is

Answer: (D)

Multiply by and set the imaginary part to zero: , i.e. . With this becomes , so (giving ) or , which has a real root (a numerical check at

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Question ID VK-013246