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Solve x^2+1 = 0.(a) x=1, -1(b) x=i, -i(c) x=-1(d) x=iThe question was asked in a national level competition.My question comes from Quadratic Equations in portion Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

The CORRECT option is (B) x=i, -i

The best explanation: x^2+1 = 0

=>x^2 = -1 => x = ±\(\sqrt{-1}\) = ±i.



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