Question

Which choice is equivalent to the expression below?V-81A. 91B. AiC.D. -29E. -9SUBMIT

Answer 1

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