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Simplify (x - 3y)2 - (x + 3y)2

Mathematics
WAEC 2009
Simplify (x - 3y)2 - (x + 3y)2
  • A. 2(x + 3y)
  • B. (2x - 3y)
  • C. -12xy
  • D. 6xy
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Correct Answer: Option C
Explanation
(x - 3y)2 - (x + 3y)2 = [(x - 3y) - (x + 3y)]

[(x + 3y + x + 3y)] = [-6y] [2x]

= -12xy
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