1 Answer

Eliza Weisman · Answer 1 · 2023-04-20T02:34:55+0000

Given the expression:

$\sqrt[]{-81}$

As we know, there is no square root for the negative numbers

But, using the complex numbers:

$i=\sqrt[]{-1}$

So, the given expression can be written as:

$\sqrt[]{-81}=\sqrt[]{-1}\cdot\sqrt[]{81}=i\cdot9=9i$

So, the answer will be option A) 9i

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