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Square roots of -7 are____________(a) 7i and -7i(b) \(\sqrt{7}\) i(c) –\(\sqrt{7}\) i(d) \(\sqrt{7}\) i and –\(\sqrt{7}\) iI got this question by my college director while I was bunking the class.This question is from Complex Numbers-2 in portion Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer» CORRECT choice is (d) \(\sqrt{7}\) i and –\(\sqrt{7}\) i

For explanation: We know, i^2 = -1.

-7 = 7(i^2)

Square ROOT of i^2 is ±i so, square root of -7 are \(\sqrt{7}\)i and –\(\sqrt{7}\)i.


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