CPM Homework Help : CCA2 Problem 8-71

Explain why $i^{3} = –i$ . What does $i^{4}$ equal?

Hint:

$i ^{3} = i ^{2} · i$ . What does $i ^{2}$ equal?

More Help:

How can you rewrite $i ^{4}$ as a product of $i ^{2}$ and/or $i$ factors?