CPM Homework Help : PCT Problem 11-12

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11-12.

Recall the definition $i = \sqrt { - 1 }$ . Simplify the following expressions.

$\sqrt { - 16 }$
Answer (a):
$4i$

$\sqrt { - 8 }$
Step (b):
$\sqrt{-1}\sqrt{8}$

$5 − \sqrt { - 9 }$
Step (c):
$5-\sqrt{-1}\sqrt{9}$

$\frac { 4 + \sqrt { - 12 } } { 2 }$
Step (d):
$\frac{4}{2}+\frac{\textit{i}\sqrt{12}}{2}$

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