Simplify (12- square root of -81)/2

Math
Pull out imaginary unit .
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Rewrite as .
Rewrite as .
Rewrite as .
Simplify the numerator.
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Rewrite as .
Pull terms out from under the radical, assuming positive real numbers.
Move to the left of .
Multiply by .
Split the fraction into two fractions.
Simplify each term.
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Divide by .
Move the negative in front of the fraction.
Simplify (12- square root of -81)/2

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