CPM Homework Help : A2C Problem 11-160

Hint (a):

$\frac{(2)}{4}+\frac{2i(2)}{4}+\frac{(-1)(2)}{4}$

Answer (a):

Answer (b):

Hint (c):

Notice that the expressions in parts (a) and (b), when squared, result in the value of i.

Hint (d):