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September 17, 2014

September 17, 2014

Posted by **Gabby** on Thursday, July 29, 2010 at 11:53pm.

- algebra -
**Reiny**, Friday, July 30, 2010 at 7:27am(√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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