28.01.2015 Views

Math 211 Business Calculus Applications of Derivatives

Math 211 Business Calculus Applications of Derivatives

Math 211 Business Calculus Applications of Derivatives

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

– 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<br />

if and only if 6480 = 5<br />

x 2

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!