Posted by raven on Friday, February 5, 2010 at 5:40pm.
what (5 radical 2)(5+radical 2)

math  drwls, Friday, February 5, 2010 at 5:44pm
Use the fact that (a + b)(a  b)
= a^2  b^2,
The answer is 25  2 = 23

math  Reiny, Friday, February 5, 2010 at 5:45pm
(5 √2)(5+√2)
= 25  2
= 23
this resembles the difference of square pattern
(a+b)(ab) = a^2  b^2
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