2x^2+3xy-4x^2 x=2 y=4

This is just a matter of plugging the x and y values into the given equation

First simplify 2x^2 + 3xy - 4x^2 = -2x^2 + 3xy

Now plug in

-2(2)^2 + 3(2)(4) = -2(4) + 24 = -8 + 24 = 16

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