Given X-Y = - 3, xy = 2, what is 3x-5y - (x-3y-4xy)
3x-5y-(x-3y-4xy)
=3x-5y-x+3y+4xy
=2x-2y+4xy
=2(x-y)+4xy
=2×(-3)+4×2
=-6+8
=2
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