Hard Mathematics Chapter 1: Real Numbers Class 10 Level 15

किस विकल्प में (x+y) परिमेय है, जबकि (x) और (y) दोनों अपरिमेय हैं?

In which option is (x+y) rational while both (x) and (y) are irrational?

Explanation opens after your attempt
Correct Answer

A. \(x=\sqrt{8},y=-2\sqrt{2}\)

Step 1

Concept

\(\sqrt{8}=2\sqrt{2}\), so (x) and \(y=-2\sqrt{2}\) are both irrational.

Step 2

Why this answer is correct

Their sum is \(2\sqrt{2}-2\sqrt{2}=0\), which is rational.

Step 3

Exam Tip

Opposite irrational terms can give a rational sum. चरण 1: \(\sqrt{8}=2\sqrt{2}\), इसलिए (x) और \(y=-2\sqrt{2}\) दोनों अपरिमेय हैं। चरण 2: उनका योग \(2\sqrt{2}-2\sqrt{2}=0\), जो परिमेय है। चरण 3: विपरीत अपरिमेय पदों के योग से परिमेय उत्तर मिल सकता है।

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What is the correct answer to this Mathematics MCQ?

The correct answer is A. \(x=\sqrt{8},y=-2\sqrt{2}\).

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