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RailwaysSSCMathAlgebraMedium

Algebra practice question for Railways, SSC. Review the correct answer and explanation, then continue with related practice below.

Question language / प्रश्न भाषा

Question

प्रश्न: If x − y = 6 and x^2 + y^2 = 68, find xy. यदि x − y = 6 तथा x^2 + y^2 = 68 है, तो xy का मान ज्ञात कीजिए।

Answer and explanation are free to read — no sign-in required.उत्तर और व्याख्या पढ़ने के लिए साइन-इन आवश्यक नहीं है।

A

12 / 12

B

14 / 14

C

16 / 16

✓

D

18 / 18

Correct Answerसही उत्तर

C. 16 / 16

Explanationव्याख्या

(x − y)^2 = x^2 + y^2 − 2xy 36 = 68 − 2xy 2xy = 32, so xy = 16. (x − y)^2 = x^2 + y^2 − 2xy 36 = 68 − 2xy 2xy = 32, अतः xy = 16.

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