We know that,

\implies{1=\sqrt {1}}

\implies\sqrt {(-1)×(-1)}

\implies\sqrt {(-1)}×\sqrt {(-1)}

\implies{i×i}

\implies {i^2}

\implies\fbox {-1} **[Proved]**

**Find the mistake**

We know that,

\implies{1=\sqrt {1}}

\implies\sqrt {(-1)×(-1)}

\implies\sqrt {(-1)}×\sqrt {(-1)}

\implies{i×i}

\implies {i^2}

\implies\fbox {-1} **[Proved]**

**Find the mistake**

1 Like

(\sqrt{-1})²

=\sqrt{(-1)²}

=\sqrt{1}

=1

Wrong. But half is correct

\fbox{Right answer.}

1 Like