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Write in terms of \( i \). Simplify your answer as much as possible, \[ \sqrt{-38} \]

Ask by Johnston Weber. in the United States
Feb 03,2025

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Answer

\[ \sqrt{-38} = \sqrt{38}\,i \]

Solution

To express \(\sqrt{-38}\) in terms of the imaginary unit \(i\), follow these steps: 1. **Factor the Negative Sign**: \[ \sqrt{-38} = \sqrt{38 \times (-1)} \] 2. **Separate the Square Root**: \[ \sqrt{38 \times (-1)} = \sqrt{38} \times \sqrt{-1} \] 3. **Use the Definition of \(i\)**: \[ \sqrt{-1} = i \] 4. **Combine the Results**: \[ \sqrt{38} \times i = \sqrt{38}\,i \] Since 38 factors into \(2 \times 19\) and neither 2 nor 19 are perfect squares, the expression \(\sqrt{38}\,i\) is already in its simplest form. \[ \sqrt{-38} = \sqrt{38}\,i \]

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The Deep Dive

To express \(\sqrt{-38}\) in terms of \(i\), we recognize that the negative sign indicates we can use the imaginary unit \(i\), where \(i = \sqrt{-1}\). We can rewrite \(\sqrt{-38}\) as: \[ \sqrt{-38} = \sqrt{38} \cdot \sqrt{-1} = \sqrt{38} \cdot i \] Thus, the simplified answer is: \[ \sqrt{-38} = i\sqrt{38} \]

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