SOLUTION: Can I get a step-by-step on how to simplify the following? √(-128) √(-16)

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Question 599317: Can I get a step-by-step on how to simplify the following?
√(-128) √(-16)
Found 2 solutions by jim_thompson5910, josmiceli:
Answer by jim_thompson5910(35256) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+sqrt%28-128%29+%2A+sqrt%28-16%29+
+sqrt%28+128%29+%2A+sqrt%28-1%29+%2A+sqrt%2816%29+%2A+sqrt%28-1%29+
+8%2Asqrt%282%29+%2A+i+%2A+4+%2A+i+
+32%2Asqrt%282%29%2A+i%5E2+
+-32%2Asqrt%282%29+
If one of the square roots is negative,
I can also end up with
+32%2Asqrt%282%29+