SOLUTION: Please help me with this problem: How would you solve this by multiplying, then simplifying? (sqrt2+ 1)(sqrt2 -1)

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Question 138272: Please help me with this problem:
How would you solve this by multiplying, then simplifying?
(sqrt2+ 1)(sqrt2 -1)
Answer by Fombitz(13823) About Me  (Show Source):
You can put this solution on YOUR website!
In general,
%28a%2Bb%29%28c%2Bd%29=ac%2Bad%2Bbc%2Bbd
Specifically in your case,
%28sqrt%282%29%2B1%29%28sqrt%282%29-1%29=%28sqrt%282%29%29%28sqrt%282%29%29%2Bsqrt%282%29%28-1%29%2B%281%29%28sqrt%282%29%29%2B%281%29%28-1%29
%28sqrt%282%29%2B1%29%28sqrt%282%29-1%29=2-sqrt%282%29%2B%28sqrt%282%29%29-1
%28sqrt%282%29%2B1%29%28sqrt%282%29-1%29=2-1
%28sqrt%282%29%2B1%29%28sqrt%282%29-1%29=1