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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(3-\sqrt{2}\) की प्रकृति सही बताता है?

Which option correctly describes the nature of \(3-\sqrt{2}\)?

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Correct Answer

B. अपरिमेय, क्योंकि परिमेय में से अपरिमेय घटा हैIrrational because an irrational is subtracted from a rational

Step 1

Concept

(3) is rational and \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

A rational number minus an irrational number remains irrational.

Step 3

Exam Tip

Do not classify the whole expression by looking only at the rational part. चरण 1: (3) परिमेय है और \(\sqrt{2}\) अपरिमेय है। चरण 2: परिमेय संख्या में से अपरिमेय घटाने पर परिणाम अपरिमेय रहता है। चरण 3: केवल परिमेय पद देखकर पूरे व्यंजक को परिमेय न मानें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि (r) परिमेय और (s) अपरिमेय है, तो (r-s) कब अपरिमेय होगा?

If (r) is rational and (s) is irrational, when will (r-s) be irrational?

Explanation opens after your attempt
Correct Answer

A. हमेशाAlways

Step 1

Concept

A rational number minus an irrational number is irrational.

Step 2

Why this answer is correct

If (r-s) were rational, then (s=r-(r-s)) would be rational, which is impossible.

Step 3

Exam Tip

Use the same reasoning for subtraction as for addition. चरण 1: परिमेय संख्या में से अपरिमेय संख्या घटाने पर परिणाम अपरिमेय रहता है। चरण 2: यदि (r-s) परिमेय हो, तो (s=r-(r-s)) परिमेय हो जाएगा, जो असंभव है। चरण 3: घटाव में भी वही सोच रखें जो योग में रखते हैं।

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