Hard Mathematics Chapter 1: Real Numbers Class 10 Level 15

यदि \(x=1+\sqrt{2}\), तो \(x^2-2x\) का मान क्या है?

If \(x=1+\sqrt{2}\), what is the value of \(x^2-2x\)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

(x-2-2x=x(x-2)).

Step 2

Why this answer is correct

With \(x=1+\sqrt{2}\), \(x-2=\sqrt{2}-1\), so the product (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1).

Step 3

Exam Tip

Recognizing conjugate-like forms makes calculation shorter. चरण 1: (x-2-2x=x(x-2)) है। चरण 2: \(x=1+\sqrt{2}\) रखने पर \(x-2=\sqrt{2}-1\), इसलिए गुणन (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1) मिलता है। चरण 3: संयुग्मी जैसे रूपों को पहचानने से गणना छोटी होती है।

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What is the correct answer to this Mathematics MCQ?

The correct answer is A. (1).

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