Simplify radical -81

Mathematics

1 answer:

Solnce55 [7]3 years ago

5 0

Step-by-step explanation:

-81

$\sqrt{ - 1} \: \times \sqrt{81}$

$\sqrt{ - 1} = i$

$i \times \sqrt{9 {}^{2} }$

$i \times 9$

$9i$

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