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Evaluate (complex solution)
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Real Part (complex solution)
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\sqrt{-5}
Subtract 9 from 4 to get -5.
\sqrt{5}i
Factor -5=5\left(-1\right). Rewrite the square root of the product \sqrt{5\left(-1\right)} as the product of square roots \sqrt{5}\sqrt{-1}. By definition, the square root of -1 is i.
\sqrt{-5}
Subtract 9 from 4 to get -5.