Write in terms of i.
-$\sqrt { - 81 }$
A) $- 9 \mathrm { i }$
B) $- \mathrm { i } \sqrt { 9 }$
C) $9 \mathrm { i }$
D) $\pm 9$

Name: Write in terms of i. -$\sqrt { - 81 }$ A) $- 9 \mathrm { i }$ B) $- \mathrm { i } \sqrt { 9 }$ C) $9 \mathrm { i }$ D) $\pm 9$
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Question

Quizplus · Accepted Answer

The square root of -81 can be written as $\sqrt{-81} = \sqrt{81} \cdot \sqrt{-1} = 9i$, where $i$ is the imaginary unit defined as $\sqrt{-1}$.

Write in Terms of I −81\sqrt { - 81 }−81​ A) −9i- 9 \mathrm { i }−9i

Write in Terms of I $\sqrt { - 81 }$ A) $- 9 \mathrm { i }$