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1. 1/2a+b2+a-b2=

  • A. a2+b2
  • B. a2+b2
  • C. a2+b2
  • D. a2+b2

Answer: Option A

Explanation:

1/2{(a + b)^2 + (a - b)^2
= 1/2(a^2 + 2ab + b^2 + a^2 - 2ab + b^2)
= 1/2(2a^2 + 2b^2)
= 1/2*2(a^2 + b^2)
= (a^2 + b^2)

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