किस विकल्प में \(\sqrt{a}+\sqrt{b}\) अपरिमेय है, पर (\(\sqrt{a}+\sqrt{b}\)\(\sqrt{a}-\sqrt{b}\)) परिमेय है?
In which option is \(\sqrt{a}+\sqrt{b}\) irrational but (\(\sqrt{a}+\sqrt{b}\)\(\sqrt{a}-\sqrt{b}\)) rational?
Explanation opens after your attempt
A. (a=7,b=2)
Concept
For (a=7,b=2), \(\sqrt{7}+\sqrt{2}\) is irrational.
Why this answer is correct
The product is (\(\sqrt{7}\)2-\(\sqrt{2}\)2=7-2=5), which is rational.
Exam Tip
A conjugate product can give a rational result even when the sum is irrational. चरण 1: (a=7,b=2) पर \(\sqrt{7}+\sqrt{2}\) अपरिमेय है। चरण 2: गुणन (\(\sqrt{7}\)2-\(\sqrt{2}\)2=7-2=5) परिमेय है। चरण 3: संयुग्मी गुणन अपरिमेय योग को भी परिमेय गुणनफल दे सकता है।
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