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December 19, 2014

December 19, 2014

Posted by **Heather** on Wednesday, January 9, 2013 at 1:00pm.

e^x-4=-e^-x

when I work i get

x-In(u)

is this correct

- math -
**Steve**, Wednesday, January 9, 2013 at 2:25pmWe left off at that point in my previous answer. Apparently you did not do much work thereafter.

If you let u=e^x, your equation becomes

u-4 = -1/u

u^2 - 4u + 1 = 0

u = 2±√3

since u=e^x, x=ln(u)

so, x = ln(2+√3) or ln(2-√3)

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