Problem 18 of 7
Rewrite sqrt(-81) using i.
Hints
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
factor sqrt(-1).
Hidden until you reveal it.
Radicand must be negative.
Enter your answer
No answer yet
Correct
Your answer is equivalent to the expected form.
Solution
Walkthrough
Walkthrough shown
Full solution stays hidden until you ask for it.
1. Factor the radicand as -1 times a positive number.
2. Replace sqrt(-1) with i.
3. Simplify the remaining positive radical.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Real-number answers for negative square roots.