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WAEC - Mathematics (2009 - No. 30)
Simplify (x - 3y)
2
- (x + 3y)
2
2(x + 3y)
(2x - 3y)
-12xy
6xy
Forklaring
(x - 3y)
2
- (x + 3y)
2
= [(x - 3y) - (x + 3y)]
[(x + 3y + x + 3y)] = [-6y] [2x]
= -12xy
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