1=(-1) {Proved}

[ib-Rahim_010]

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

[nargisakter1572]

(\sqrt{-1})²

=\sqrt{(-1)²}

=\sqrt{1}

=1

[ib-Rahim_010]

Wrong. But half is correct

[sarkerdipokkumar836]

[ib-Rahim_010]

\fbox{Right answer.}