The quadratic function given by $f(x_1, x_2) = \begin{bmatrix} x_1 & x_2 \end{bmatrix} \begin{bmatrix} 2 & 1 \ 1 & 2 \end{bmatrix} \begin{bmatrix} x_1 \ x_2 \end{bmatrix}$ is convex.
Added by Sara P.
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Step 1: Write the quadratic form and the matrix: f(x1,x2) = [x1 x2] [[2, 1], [1, 2]] [x1; x2], so A = [[2,1],[1,2]]. Show more…
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