Math

Could someone please help me with this math problem? This is what I have so far but now I am stumped as to what to do next.
Multiply and simplify by factoring.
The square root of 18 * square root of 40.
The square root of 18= the square root of 9*2. The square root of 9 * square root of 2= square root of 3 * square root of 2.
Now for the square root of 40. 2* the square root of 10.
This is where I am stumped. What do I do next?
Thanks for the help.

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  1. Never mind I figured out the answer.

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