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Let x+ y= x+ y for all x, y R . What is ( x 2 + y 2 ) equal to?

Options

  1. A1
  2. B2
  3. C2
  4. D2 2

Correct answer

A. 1

Step-by-step solution

Given. aligned & x+ y= x+ y & 2 ( x+y 2 ) ( x-y 2 ) & =2 ( x+y 2 ) ( x-y 2 ) aligned On dividing 2 ( x+y 2 ) ( x-y 2 ) both side ( x+y 2 )=1

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