Chapter 1 - Section 1.3 - Complex Numbers; Quadratic Equations in the Complex Number System - 1.3 Assess Your Understanding - Page 112: 52

$0+8i=8i$

Work Step by Step

Recall, $i=\sqrt{-1}$, so $i^{2}=-1$. Thus, we obtain: $\sqrt{-64}=\sqrt{64}\sqrt{-1}=8i$

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