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Math 211 Business Calculus Applications of Derivatives

Math 211 Business Calculus Applications of Derivatives

Math 211 Business Calculus Applications of Derivatives

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– p. 30/34<br />

Fence Solution<br />

Solve xy = 810 fory:<br />

y = 810/x<br />

Substitutey = 810/x into the cost equation<br />

C = 8y +5x = 8· 810 6480<br />

+5x =<br />

x x +5x<br />

Differentiate (with respect tox) and set to 0:<br />

dC<br />

dx = −6480 +5 = 0<br />

x 2

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