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January 29, 2015

January 29, 2015

Posted by **Miley** on Monday, May 19, 2008 at 7:34pm.

2e^-x+4=21. how do i do this problem.

i know that you subtract 4, but what do you do after that?

- alg 2. -
**Damon**, Monday, May 19, 2008 at 7:50pm2e^-x+4=21

2 e^-x = 17

e^-x = 17/2

1/e^x = 17/2

so

e^x = 2/17

take natural log of both sides

x = ln (2/17)

- alg 2. -
**Miley**, Monday, May 19, 2008 at 8:02pmcan you please show me how you got e^x=2/17. thanks

- alg 2. -
- alg 2. -
**Damon**, Tuesday, May 20, 2008 at 8:00pmin general

a^-b = 1/a^b

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