1. what should be subtracted from 4x2+2xy-3y to obtain x2+y2+3xy ?

Let the required expression be P.now, 4x2+2xy-3y - P = x2+y2+3xyP = 4x2+2xy-3y - x2+y2+3xyP = 4x2+2xy-3y-x2-y2-3xyP = 3x2-xy-3y-y2

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