SOLUTION: please help me with this problem, Multipy (3sqrt2 - 6sqrt7)(4sqrt2 + 8sqrt7)= I came up with -312 It said to simplify my answer and type exact answer using radicals as n

Question 516154: please help me with this problem,

Multipy
(3sqrt2 - 6sqrt7)(4sqrt2 + 8sqrt7)=
I came up with -312
It said to simplify my answer and type exact answer using radicals as needed, I need to submit by 3am est. If anyone can and show me how they worked it I appreciate it, if not, that is ok too.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

Follow the rule:

------------
That is if only the positive square roots are required.
Usually that's true.
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