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**scg4d** Hi everyone. I'm looking for help with converting this function to quadratic form.

The function is f(x1,x2)=(x2-x1)^4 + (12*x1*x2) - x1 + x2 - 3.

The quadratic form I need to convert to is: f(x)=(1/2)x'Qx - x'b + h

where x is a vector=[x1 x2]', '=transpose, Q and b are vectors, and h is the constant. Also, Q is symmetric and positive definite (Q=Q' > 0).

The trouble I'm running into is that f(x1,x2) is 4th order, and the examples I have convert only 2nd order functions to the f(x) quadratic objective format above.