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Q: Simplify the following expression (c + d)² – (c – d)² .
  • A. 2(c² + d²)
  • B. (c² + d²)
  • C. 4cd
  • D. 2cd
Correct Answer: Option C - (c + d)² – (c – d)² = c² + d² + 2cd – c²– d² + 2cd = 4cd
C. (c + d)² – (c – d)² = c² + d² + 2cd – c²– d² + 2cd = 4cd

Explanations:

(c + d)² – (c – d)² = c² + d² + 2cd – c²– d² + 2cd = 4cd