# Need help taking the derivative of these 2 equations

1. Oct 17, 2009

### noname1

Need help taking the derivative of these 2 equations

sx+t

sx^3+x+2t

for the first i believe its
y = s

for the second i am not sure if its but i believe its the first one

y = 3sx^2+1

or

y` = 3sx^2+1+2

is this correct? the second one is kind of throwing me off with the b

2. Oct 17, 2009

### jbunniii

Re: Derivatives

With respect to which variable? s, x, or t?

3. Oct 18, 2009

### noname1

Re: Derivatives

to x, s and t are constants

4. Oct 18, 2009

### Staff: Mentor

Re: Derivatives

First off, these aren't equations. They are just expressions.
Yes.
Yes.
No. From what you said in a later post, s and t are constants, so d/dx(t) = 0.
What b?