i)−2xy2 – 4x2 y
ii) 9x2 + 3x + 15x3
iii) xy – 2y + 5x − 10
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Answer:
(i) 3x + 7x = (3 + 7) x = 10x
(ii) -5xy + 9xy = (-5 + 9)xy = 4xy
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