# Thread: Finding the derivative

1. ## Finding the derivative

What would the derivative of this be using the rules (or not using the rules doesn't matter)?

4
___

square root of(1 - x)

Any help would be appreciated.

2. $\frac{4}{\sqrt{1-x}}$

Use the quotient rule.

3. We didn't learn it yet in class, that's why I was kind of hoping for an answer. The answer I got was:

4
___________
x^2 - 2x + 1

But it seems pretty wrong.