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

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