The equivalent number of -1 is required from the expressions.
The correct option is C. [tex]i^2[/tex].
Complex numbers are not real that means they cannot exist in actuality.
They are represented by the square root of a negative number.
[tex]i=\sqrt{-1}[/tex]
[tex]-i=-\sqrt{-1}[/tex]
[tex]i^2=(\sqrt{-1})^2=-1[/tex]
[tex]-i^2=-(\sqrt{-1})^2=-(-1)=1[/tex]
[tex]i^4=(\sqrt{-1})^2(\sqrt{-1})^2=-1\times -1=1[/tex]
So, only option C is correct.
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