Result of taking the square root of a negative number:
[tex]\begin{gathered} \sqrt{-a}=\sqrt{a}*\sqrt{-1} \\ \\ \sqrt{-1}=i \\ \\ \sqrt{-a}=\sqrt{a}i \end{gathered}[/tex]As you can see above the result of taking the square root of a negative number is a imaginary number.Answer: B
