SOLUTION: (2-sqrt7)^2= ? it says to simplify expression thanks for your help!

Question 637292: (2-sqrt7)^2= ? it says to simplify expression thanks for your help!
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!

IMPORTANT: Exponents so not distribute! So simplifying this expression is not done by squaring the 2 and squaring the square root!!

To simplify this expression we can either use FOIL on or use the pattern.

I prefer using the pattern. With an "a" of "2" and a "b" of "", the pattern tells us that

would be

which simplifies as follows:

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