Concept-wise Practice

conjugate squares MCQ Questions for Class 10

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Practice Questions

1 questions tagged with conjugate squares.

यदि \(x=4+\sqrt{15}\) और \(y=4-\sqrt{15}\), तो \(x^2+y^2\) का मान क्या है?

If \(x=4+\sqrt{15}\) and \(y=4-\sqrt{15}\), what is the value of \(x^2+y^2\)?

Explanation opens after your attempt
Correct Answer

A. (62)

Step 1

Concept

(x) and (y) are conjugates.

Step 2

Why this answer is correct

(x-2+y-2=2\(4^2+15\)=2(31)=62).

Step 3

Exam Tip

In the sum of squares of conjugates, irrational terms cancel. चरण 1: (x) और (y) संयुग्मी हैं। चरण 2: (x-2+y-2=2\(4^2+15\)=2(31)=62)। चरण 3: संयुग्मी वर्गों के योग में अपरिमेय पद कट जाते हैं।

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