Sunday

December 21, 2014

December 21, 2014

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!

**Answer this Question**

**Related Questions**

Math - Exponential equation - Solve the exponential equation. Express your ...

college algebra - Solve the exponential equation. Express your solutions in ...

Math - 2 - Solve the exponential equation. Express your solutions in exact form ...

precalculus - solve the exponential equation express in exact form only show all...

Math - Solve the logarithmic equation. Express your solutions in exact form only...

College Algebra - Solve the logarithmic equation. Express your solutions in ...

calculus - Having a really hard time with this! e^8x^2-5 = 14 solve the ...

algebra - solve the exponential equation Express in exact form. 5e^xlog_9 = 11 ...

precalculus - Solve the logarithmic equation. Express your solutions in exact ...

precalculus - solve exponential equation. express in exact form. e^x-42e^-x= -19