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
Correct Answer: C. -12xy
Explanation
(x - 3y)2 - (x + 3y)2 = [(x - 3y) - (x + 3y)]
[(x + 3y + x + 3y)] = [-6y] [2x]
= -12xy
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