math
posted by
raven
.
what (5 radical 2)(5+radical 2)

math 
drwls
Use the fact that (a + b)(a  b)
= a^2  b^2,
The answer is 25  2 = 23

math 
Reiny
(5 √2)(5+√2)
= 25  2
= 23
this resembles the difference of square pattern
(a+b)(ab) = a^2  b^2