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WAEC - Mathematics (2009 - No. 30)

Simplify (x - 3y)2 - (x + 3y)2
2(x + 3y)
(2x - 3y)
-12xy
6xy

解释

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

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

= -12xy

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