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Posted by **anon** on Tuesday, December 20, 2011 at 9:40pm.

e^2x - 9e^x - 20 = 2

- pre calculus -
**Reiny**, Wednesday, December 21, 2011 at 9:13am(e^x)^2 - 9e^x - 22 = 0

let y = e^x

y^2 - 9x - 22 = 0

(y-11)(y+2) = 0

y = 11 or y = -2

e^x = 11**x = ln 11**

or

e^x = -2, no solution ( x = ln(-2) which is undefined)

- pre calculus -
**anon**, Wednesday, December 21, 2011 at 10:38amThank u!

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