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Svet_ta [14]
3 years ago
11

How to solve this problem

Mathematics
1 answer:
Eddi Din [679]3 years ago
8 0

Answer:

Solving the radical \pm\sqrt{-81}  we get \mathbf{\pm9 \ i}

Step-by-step explanation:

We need to express the radical \pm\sqrt{-81} using the imaginary unit i

Prime factors of 81 are: 3x3x3x3

and \sqrt{-1}=i

Solving:

\pm\sqrt{-81}\\=\pm\sqrt{81}\sqrt{-1}\\=\pm\sqrt{3\times3\times3\times3}i\\ =\pm\sqrt{3^2\times3^2}i\\=\pm3\times3\ i\\=\pm9 \ i

So, Solving the radical \pm\sqrt{-81}  we get \mathbf{\pm9 \ i}

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