CPM Homework Help : CCA2 Problem 8-70

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8-70.

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

$-18 -\sqrt { - 25 }$
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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