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1. x+y=7

  • A. 24
  • B. 24
  • C. 24
  • D. 24

Answer: Option A

Explanation:

8xy(x2+y2)

=4xy×2(x2+y2)

=(x+y)2+(x-y)2×(x+y)2-(x-y)2

=(√7)2+(√5)2×(√7)2-(√5)2

=7+5×7-5

=24


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