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Source: — Problem Solving |

by winniethepooh » Sat Jul 23, 2011 2:55 pm
Substituting the values in the equation we get.
=[2*1^2 + (-2)](x+y) + [1+(-2)](x-y)
=(2-2)(x+y) + (-1)(x-y)
= 0 + -x+y
= y-x.

Hence , C
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