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B
(x+3y)(mx−3y−n+5)
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C
(x+3y)(x−3my−n+5)
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D
(x−3y)(mx−3my−n+5)
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Solution
The correct option is B(x−3y)(mx−3my−n+5) m(x−3y)2+n(3y−x)+5x−15y =m(3y−x)2+n(3y−x)−15y+5x =m(3y−x)2+n(3y−x)−5(3y−x) =(3y−x)(m(3y−x)+n−5) =(3y−x)(3my−mx+n−5)