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Question

Simplify: 3y(x−y)−2x(y−2x)7x(x−y)−3(x2−y2)

A
xyx+y
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B
1
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C
x+yxy
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D
0
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Solution

The correct option is C x+yxy
Given 3y(xy)2x(y2x)7x(xy)3(x2y2)
=3xy3y22xy+4x27x27xy3x2+3y2
=4x2+xy+3y24x27xy+3y2
=4x2+4xy3xy3y24x24xy3xy+3y2
=4x(x+y)3y(x+y)4x(xy)3y(xy)
=(4x3y)(x+y)(4x3y)(xy)
=x+yxy

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