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

  1. 2a^2 + 2b^2
  2. 0
  3. 4ab
  4. 2ab
Answer

C) 4ab

Expanding and collecting like terms gives (a + b)^2 - (a - b)^2 = 4ab. SLO M-09-B-15 · Knowledge

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