Simplify the left-hand side to complete the proof: (a + b)^2 + (a - b)^2 equiv

  1. 4ab
  2. a^2 + b^2
  3. 2a^2
  4. 2(a^2 + b^2)
Answer

D) 2(a^2 + b^2)

Expanding and collecting like terms gives (a + b)^2 + (a - b)^2 = 2(a^2 + b^2). SLO M-09-B-15 · Knowledge

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