Question

xamine the following functions for maxima and minima:
a) equation
b) equation

01 Dec 2025
Answer :
Word Count : 402
For function ( z = -x^2 + xy - y^2 + x + 5y ), we first find the partial derivatives: [ \frac{\partial z}{\partial x} = -2x + y + 1, \quad \frac{\partial z}{\partial y} = x - 2y + 5 ] Setting them equal to zero: [ -2x + y + 1 = 0 \quad \Rightarrow \quad y = 2x - 1 ] [ x - 2y + 5 = 0 \quad \Rightarrow \quad x - 2(2x - 1) + 5 = 0 ] [ x - 4x + 2 + 5 = 0 \quad \Rightarrow \quad -3x + 7 = 0 \quad \Rightarrow \quad x = \frac{7}{3} ] [ y = 2 \cdot \frac{7}{3} - 1 = \frac{14}{3} - \frac{3}{3} = \frac{11}{3} ] Second derivatives: [ \frac{\partial^2 z}{\partial x^2} = -2,
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