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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 13] The Extremutn of a Function of Several Variables 225<br />

54 3<br />

~__ 2<br />

x -=- and = 7<br />

/ --, thend / >0, and, consequently, the function<br />

2 o o<br />

5<br />

has a conditional m<strong>in</strong>imum at this po<strong>in</strong>t. If K- 4^3<br />

-^ , then d<br />

Z<br />

x = -- and = f/ -=- ,<br />

O D<br />

zF

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