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How do you multiply #(sqrt(a) +sqrt(b))(sqrt(a)-sqrt(b))#?

1 Answer

Oct 25, 2014

You can treat it like Difference of Two Squares

#(a + b)(a - b) = a^2 - b^2#

#(root 2 a + root 2 b)(root 2 a - root 2 b)#

#=> root 2 (a^2) - root 2 (b^2)#
#=> a - b#

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