SOLUTION: I need help understanding the solution to this problem. (square root 2 +1) (square root 2 - 3) = (I used the FOIL method) (2 - 3) -3 square root 2 + square root 2 = -1 -2 square ro

Algebra ->  Radicals -> SOLUTION: I need help understanding the solution to this problem. (square root 2 +1) (square root 2 - 3) = (I used the FOIL method) (2 - 3) -3 square root 2 + square root 2 = -1 -2 square ro      Log On


   

Question 763293: I need help understanding the solution to this problem. (square root 2 +1) (square root 2 - 3) = (I used the FOIL method) (2 - 3) -3 square root 2 + square root 2 = -1 -2 square root 2. I do not understand where the -2 square root 2 came from. Please help.
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

%28sqrt%282%29+%2B1%29%28sqrt%28+2%29+-+3%29
%28sqrt%282%29%29%5E2-3sqrt%282%29+%2Bsqrt%28+2%29+-+3
2-2sqrt%282%29+-+3
-2sqrt%282%29+-+1
-2%2A1.41+-+1
-2.82+-+1
-3.82+
or, simply like this:
%28sqrt%282%29+%2B1%29%28sqrt%28+2%29+-+3%29
%281.41+%2B1%29%281.41+-+3%29
%282.41%29%28-1.58%29
-3.82