Express the number in terms of j (if necessary, round the result to three significant digits). $\sqrt { - 81 }$
A) 9
B) 81j
C) 9j
D) -9j
E) -9

Name: Express the number in terms of j (if necessary, round the result to three significant digits). $\sqrt { - 81 }$ A) 9 B) 81j C) 9j D) -9j E) -9
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Question

Quizplus · Accepted Answer

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

Express the Number in Terms of J (If Necessary, Round −81\sqrt { - 81 }−81​

Express the Number in Terms of J (If Necessary, Round $\sqrt { - 81 }$