SOLUTION: Please help. I need to Thanks in advance!

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Question 88352: Please help.
I need to
Thanks in advance!
Answer by malakumar_kos@yahoo.com(315) About Me  (Show Source):
You can put this solution on YOUR website!

simplify (3-2 square root 7)(3+2 square root 7).
(3-2 square root 7).(3+2 square root 7).
(3)^2 - (2 square root 7)^2 [use formula (a+b).(a-b) = a^2-b^2]
9 - 7
= 2