Posted by Gabby on Thursday, July 29, 2010 at 11:53pm.
(√2 + 3√5)(√2 - 3√5)
this has the pattern for the difference of squares
(a + b)(a - b) = a^2 - b^2
so your question has an answer of
(√2)^2 - (3√5)^2
= 2 - 45
= -43
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