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7. Express each of the following functions as a matrix product: x Ax, where x is a column vector and A is a square, symmetric

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7. Express each of the following functions as a matrix product: x Ax, where x is a column vector and A is a square, symmetric matrix. a. f(x, y) = 3x2 - 4xy + 7y2 b. d2 (g(Xo, yo)) = f(dx, dy) = gxxdx2 + gyxdydx + gxydydx + gyydy c. f(X1, X2, X3) = 3x, - 2X1X2+ 4x1X3 + 5x2 + 4x3 -2X2x3

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