Show that (5+√2) (5 -√2) is a rational number
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as we know that (5+√2)(5-√2) is just like (a+b)(a-b) which is = a^2-b^2
similarly
(5+√2)(5-√2)= 5^2-(√2)^2
= 25-2
= 23 ; here is the answer
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