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Simplify. −81--√ pls help

Simplify. −81--√ pls help
asked 223k views
5 votes
Simplify.


−81--√ pls help

asked
User Meshy
by
7.8k points

1 Answer

4 votes

Answer:

9i

Explanation:

Complex numbers:

i² = -1


√(-81)=√(81i^2)\\


\sf \bf = √(9*9*i * i)\\\\ = 9i

answered
User Maxim Akristiniy
by
8.1k points
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