## Kainui 2 years ago e^x=-x solve for x

apply ln (natural log) of both sides

2. waleed_imtiaz

what I have to do here? take left hand side... =e^x ...take log ... xlne =x....=R.H.S

3. Kainui

$x=\ln(-x)$

4. Kainui

All this tells me is that x must be negative, otherwise the log function will be broken.

5. Kainui

I know there's an answer because the graphs of y=e^x and y=-x intersect at some point.

6. waleed_imtiaz

x should be positive I think so thats why we take mood like ln|x|

7. satellite73

good luck algebra will not do it

8. satellite73

you will use technology or numerical methods

9. satellite73
10. Kainui

Damn, there's no alternative trick then? Hmm.