given that x+y+z=3 and xy+yz+zx=a . find that value of a for which a(max) - a(min)= 8

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- October 11th 2012, 08:28 AMgeniusgarvilfind the value
given that x+y+z=3 and xy+yz+zx=a . find that value of a for which a(max) - a(min)= 8

- October 11th 2012, 10:33 AMMaxJasperRe: find the value
This surface has its peak at {1, 1, 3-a} and its min at -infinity:

http://mathhelpforum.com/attachment....1&d=1349976701

So, please explain what you mean by a(min)(Hi) - October 12th 2012, 07:54 PMgeniusgarvilRe: find the value
a(min) means a's minimum value.

- October 12th 2012, 08:07 PMMaxJasperRe: find the value
So a(min)=-infinity...it appears that perhaps a(min) should have an (x,y) also assigned to it otherwise the function's min is -infinity.