The polynomial you have given has not the variable z, therefore you've omitted it.

The polynomial in discussion is x^2+y^2-xy.

The value of the polynomial for x=3 and y=-2.

x^2+y^2-xy = 3^2 + (-2)^2 - 3*(-2) =>

=> x^2+y^2-xy = 9 + 4 + 6 = 19

The value of polynomial is 19.

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