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Finding the Value of an Expression

4 x y-2 x y+3...

Question

4xy -2xy+ 3xy ; when X=-1,y=2

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Solution

4xy-2xy+3xy
=5xy

Now put x=-1 and y=2
=5×-1×2
= -10

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2xy-[4yx-{3xy-(4xy-2xy)}]

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