Question 666626

I'm having a hard time understing how to solve this problem. I'm posting this a second time as the answer I received previously just made me more confused, perhaps steps were left out, I don't know. Thank you in advance.

Simplify the following expression.
These are side by side:
square root -8 square root -24


{{{sqrt(- 8) * sqrt(- 24)}}} 


{{{sqrt(- 1 * 8) * sqrt(- 1 * 24)}}} 


{{{i * sqrt(8) * i * sqrt(24)}}}


{{{i^2 * sqrt(192)}}} ----- Multiplying both expressions


{{{- 1 * sqrt(8^2 * 3)}}}


{{{highlight_green(- 8sqrt(3))}}}


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