- Thread starter
- #1

#### coolbeans33

##### New member

- Sep 19, 2013

- 23

^{-.5x}

and why is the answer zero?

sorry I'm posting like 150 threads, I'm just really bad at math.

- Thread starter coolbeans33
- Start date

- Thread starter
- #1

- Sep 19, 2013

- 23

and why is the answer zero?

sorry I'm posting like 150 threads, I'm just really bad at math.

- Admin
- #2

- Jan 26, 2012

- 4,040

\(\displaystyle \frac{dy}{dx} \ne 0\). What have you tried? In general, what is $\dfrac {d}{dx} e^{x}$? What about $\dfrac{d}{dx} e^{f(x)}$?^{-.5x}

and why is the answer zero?

sorry I'm posting like 150 threads, I'm just really bad at math.

Also, 2k posts!

- Admin
- #3

- Mar 5, 2012

- 8,774

Uh?^{-.5x}

and why is the answer zero?

sorry I'm posting like 150 threads, I'm just really bad at math.

The answer is not zero.

The steps are the application of the chain rule.

Combined with the rule that the derivative of $e^x$ is $e^x$.

Didn't you just apply the chain rule in your previous thread?

Rather successfully in a more complicated problem I might add?