If x/y + y/x = 2, then what is the value of { (x² + y²) / (xy + y²) } ?
2024
If x/y + y/x = 2, then what is the value of { (x² + y²) / (xy + y²) } ?
- A.
0
- B.
1/4
- C.
1
- D.
More than one of the above
- E.
None of the above
Attempted by 3 students.
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Correct answer: E
Given: x/y + y/x = 2.
Step 1: Multiply both sides by xy to eliminate denominators: x² + y² = 2xy.
Step 2: Rearranging gives x² - 2xy + y² = 0, which simplifies to (x - y)² = 0. Therefore, x = y.
Step 3: Substitute x = y into the expression (x² + y²)/(xy + y²):
(x² + x²)/(x·x + x²) = (2x²)/(x² + x²) = 2x²/2x² = 1.
Thus, the value of the expression is 1.
हिन्दी उत्तर:
दिया गया है: x/y + y/x = 2।
चरण 1: दोनों पक्षों को xy से गुणा करने पर: x² + y² = 2xy।
चरण 2: पुनर्व्यवस्थित करने पर: x² - 2xy + y² = 0, जो (x - y)² = 0 के रूप में सरल होता है। इसलिए, x = y।
चरण 3: अभिव्यक्ति (x² + y²)/(xy + y²) में x = y की स्थापना करने पर:
(x² + x²)/(x·x + x²) = (2x²)/(x² + x²) = 2x²/2x² = 1।
इसलिए, अभिव्यक्ति का मान 1 है।
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