Write the Expression in the Form Bi, Where B Is $\sqrt { - 81 }$

question 103

Multiple Choice

Write the expression in the form bi, where b is a real number.
- $\sqrt { - 81 }$

• A) \(\pm 9\)
• B) \(- 9 \mathrm { i }\)
• C) \(- \mathrm { i } \sqrt { 9 }\)
• D) \(9 \mathrm { i }\)

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