what should be added to 3-2x2y-xy2  to  get 3-3x2y-2xy2 ?

Let the required expression to be added be P.3-2x2y-xy2 + P = 3-3x2y-2xy2P =  3-3x2y-2xy2 - 3-2x2y-xy2P = 3-3x2y-2xy2-3+2x2y+xy2P = -x2y-xy2

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(3-3x2y-2xy2)-(3-2x2y-xy2)
=3-3x2y-2xy2-3+2x2y-xy2
​=3-3-3x2y+2x2y-2xy2-xy2
=-x2y-3xy2
​thus,-x2y-3xy2 is to be added to3-2x2y-xy2 to get 3-3x2y-2xy2

 
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