Answer
$0$
Work Step by Step
Using $i^2=-1$ and the laws of exponents, the given expression, $
i^2+i^4
,$ is equivalent to
\begin{array}{l}\require{cancel}
i^2+(i^2)^2
\\\\=
(-1)+(-1)^2
\\\\=
-1+1
\\\\=
0
\end{array}
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