Evaluate (complex solution)
2\sqrt{21}i\approx 9.16515139i
Real Part (complex solution)
0
Evaluate
\text{Indeterminate}
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2i\sqrt{21}
Factor -84=\left(2i\right)^{2}\times 21. Rewrite the square root of the product \sqrt{\left(2i\right)^{2}\times 21} as the product of square roots \sqrt{\left(2i\right)^{2}}\sqrt{21}. Take the square root of \left(2i\right)^{2}.
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