Question

can u tell me what is
$\sqrt{ - 1}$

Answer 1

( \sqrt{-1} ) ( \sqrt{-1})\\ \\ \rightarrow ( \sqrt{-1})^2 \; \; \; \; \; \; [\; \; \; \; ( a )( a ) = a^2 \; \; \; ] \\ \\ \rightarrow -1^{\frac{1}{2} * 2 } \\ \\ \rightarrow -1^1 \\ \\ \rightarrow -1