prove that 2root3+root5 is an irrational number also check wheather (2root3+root5)(2root3-root5) ia rational or irrational.
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(a+b)(a-b)=a×a-b×b
(2 √3)(2 √3)-( √5)( √5)
12-5
7
Rational
(2 √3)(2 √3)-( √5)( √5)
12-5
7
Rational
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