SOLUTION: I would really appreciate your help!!!! I need to simplify sqrt -81 multiplied by sqrt -36 Thank you so much!

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Question 535379: I would really appreciate your help!!!! I need to simplify sqrt -81 multiplied by sqrt -36
Thank you so much!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+sqrt%28-81%29+%2A+sqrt%28-36%29+
Note that +sqrt%28-1%29+=+i+
+sqrt%2881%29%2Asqrt%28-1%29%2Asqrt%2836%29%2Asqrt%28-1%29+
+sqrt%2881%29%2Ai%2Asqrt%2836%29%2Ai+
+sqrt%2881%29%2Asqrt%2836%29%2Ai%5E2+
note that +i%5E2+=+-1+
+9%2A6%2A%28-1%29+
+-54+
Note also that square roots can be + or -,
so the answer is
+54+ and +-54+