Simplify. Write in the form
a
+
b
i
\displaystyle {a}+{b}{i}
a
+
b
i
.
−
1
+
2
i
−
5
i
2
+
7
i
3
−
3
i
4
\displaystyle \ -{1}+{2}{i}-{5}{i}^{{2}}+{7}{i}^{{3}}-{3}{i}^{{4}}
−
1
+
2
i
−
5
i
2
+
7
i
3
−
3
i
4
=
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