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Optimization Problem

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June 8, 2009
calculusderivativeirrational number

Problem Statement

If x \plus{} y \equal{} 1, then the largest value of xy xy is: <spanclass=′latex−bold′>(A)</span> 1<spanclass=′latex−bold′>(B)</span> 0.5<spanclass=′latex−bold′>(C)</span> an irrational number about 0.4<spanclass=′latex−bold′>(D)</span> 0.25<spanclass=′latex−bold′>(E)</span> 0 <span class='latex-bold'>(A)</span>\ 1\qquad <span class='latex-bold'>(B)</span>\ 0.5\qquad <span class='latex-bold'>(C)</span>\ \text{an irrational number about }{0.4}\qquad <span class='latex-bold'>(D)</span>\ 0.25\qquad <span class='latex-bold'>(E)</span>\ 0
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