# Thread: Finding the derivative of a funtion

1. ## Finding the derivative of a funtion

Can someone please expain to me how to find the derivative of this function:

(square root of (3-2x))

Thank you!

2. Originally Posted by BubblegumPops
Can someone please expain to me how to find the derivative of this function:

(square root of (3-2x))

Thank you!
$\sqrt{3-2x} = \sqrt{t}$ where $t=3-2x$.
By chain rule,
$\frac{dy}{dt} = \frac{1}{2}t^{-1/2} , \frac{dx}{dt} = -2 \mbox{ so }\frac{dy}{dx} = \frac{1}{2} (-2) t^{-1/2} = - (3-2x)^{-1/2}$