Answer
$2\sqrt 2$
Work Step by Step
For positive real numbers $a$ and $b$, $\sqrt{a}\cdot \sqrt{b}=\sqrt{ab}$.
Thus,
$
\sqrt{8}=\sqrt{4\cdot2}=\sqrt4 \cdot \sqrt2=2\sqrt 2
$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.7 nth Roots; Rational Exponents - A.7 Assess Your Understanding - Page A60: 11
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