Expert Mathematics Chapter 1: Real Numbers Class 10 Level 13

कौन-सा विकल्प \(\sqrt{a}+\sqrt{b}\) को अपरिमेय बनाता है?

Which option makes \(\sqrt{a}+\sqrt{b}\) irrational?

Explanation opens after your attempt
Correct Answer

C. (a=4,b=18)

Step 1

Concept

For (a=4), \(\sqrt{4}=2\).

Step 2

Why this answer is correct

For (b=18), \(\sqrt{18}=3\sqrt{2}\), which is irrational; so the sum \(2+3\sqrt{2}\) is irrational.

Step 3

Exam Tip

A rational plus an irrational remains irrational. चरण 1: (a=4) पर \(\sqrt{4}=2\) है। चरण 2: (b=18) पर \(\sqrt{18}=3\sqrt{2}\), जो अपरिमेय है; इसलिए योग \(2+3\sqrt{2}\) अपरिमेय है। चरण 3: यदि एक पद परिमेय और दूसरा अपरिमेय हो, तो योग अपरिमेय रहता है।

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The correct answer is C. (a=4,b=18).

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