Simplify x - 3y 2 - x 3y 2 - WAEC Mathematics 2009 Question
Simplify (x - 3y)2 - (x + 3y)2
A
2(x + 3y)
B
(2x - 3y)
C
-12xy
D
6xy
correct option: c
(x - 3y)2 - (x + 3y)2 = [(x - 3y) - (x + 3y)]
[(x + 3y + x + 3y)] = [-6y] [2x]
= -12xy
[(x + 3y + x + 3y)] = [-6y] [2x]
= -12xy
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