The expression of the given radical using the imaginary unit i is; ±9i
We want to find the square root of;
±√-81
Now, positive number would always have a definite square root. However, for negative numbers, their square root is usually an imaginary root. Thus, the answer will come with the letter "i".
Thus, we can say that;
±√-81 = ±9i
where i is the imaginary part of the root
Complete Question is;
Express the radical using the imaginary unit, i. Express your answer in simplified form.
±√-81 = ± ?
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