CPM Homework Help : INT3 Problem 2-101

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2-101.

Write each of the following expressions in $a+bi$ form.

$- 18 - \sqrt { - 25 }$
Hint (a):
$-18 - \sqrt{(-1)(25)}$
Answer (a):
$-18 - 5i$

$\frac { 2 \pm \sqrt { - 16 } } { 2 }$
Answer (b):
$1 \pm 2i$

$5 + \sqrt { - 6 }$
Answer (c):
$5 + i\sqrt{6}$

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