Asked by raven

what (5 -radical 2)(5+radical 2)
Answered by drwls
Use the fact that (a + b)(a - b)
= a^2 - b^2,
The answer is 25 - 2 = 23
Answered by Reiny
(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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