The formula given by my instructor for a Taylor Series approximation of the second order at point (a,b) is f(a,b) + grad(f(a,b))(adsbygoogle = window.adsbygoogle || []).push({}); x+ 1/2 H(f(a,b))x

If you recognize this formula, do you know what the x vector is?

Note:xis the x-vector, and H represents the Hessian Matrix. Thanks!

The Hessian Matrix is the matrix with values [fxx, fxy, fyx, and fyy], where fxx represents the second partial derivative. Not sure the proper terminology for it...... df^2 / (dx)^2 (where d is a delta (not d) to represent partial dif.)

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# 2nd Order Taylor Series Formula inv. the Hessian Matrix, etc. - what is the x vector?

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