Question

Express the radical using the imaginary unit, i. ± -81 =±

Answer 1

+/- 9i

Explanation:

+/- sqrt(-81) = +/- sqrt(-1) × sqrt(81)

= +/- 9i

Answer 2

Explanation:

Step 1: Find the radical

`\pm√(-81)`

`\pm(√(-1) * √(81))`

`\pm i*9`

`\pm 9i`

Answer:
`\pm 9i`