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December 22, 2014

December 22, 2014

Posted by **Roger** on Monday, January 7, 2013 at 10:56pm.

e^x-4=-e^-x

please show work

- math -
**Steve**, Tuesday, January 8, 2013 at 12:26amif you let u = e^x,

u-4 = -1/u

u^2 - 4u = -1

u^2 - 4u + 1 = 0

now just use the quadratic formula and if yuo get values for u, wind up with

x = ln(u) if defined

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