SOLUTION: please can you tell me how to turn root -31 into an imaginerary number? thanks

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Question 16760: please can you tell me how to turn root -31 into an imaginerary number?
thanks
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Watch this!
sqrt%28-31%29+=+sqrt%2831%2A%28-1%29%29 = sqrt%2831%29%2Asqrt%28-1%29+=+sqrt%2831%29i