document.write( "Question 379613: Calculus Problem, Applied Optimization\r
\n" ); document.write( "\n" ); document.write( "Find a positive number for which the sum of its reciprocaland four times its square is the smallest number.
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Algebra.Com's Answer #269543 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
Let \"N\" be the number.
\n" ); document.write( "\"f%28N%29=1%2FN%2B4N%5E2\"
\n" ); document.write( "\"graph%28300%2C300%2C-1%2C9%2C-1%2C9%2C0%2C1%2Fx%2B4x%5E2%29\"
\n" ); document.write( "Take the derivative of f(N) and set it equal to zero.
\n" ); document.write( "\"df%2FdN=-1%2FN%5E2%2B8N\"
\n" ); document.write( "\"1%2FN%5E2=8N\"
\n" ); document.write( "\"N%5E3=1%2F8\"
\n" ); document.write( "\"highlight%28N=1%2F2%29\"
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