<p>Find the derivative of </p>
<p>f (x)= x^1/2 + 3x^2</p>
<p>when I tried it, I got (1 / ( 2 x^1/2 ) + 6x</p>
<p>...i highly doubt that I'm right</p>
<p>that is correct., im pretty sure. try doing this. pick a value for x (i usually pick 3). then in ur calc go to math - > nderiv (or limit) and enter ur function, (comma) x, (comma) 3. then plug in 3 into the derivative u did by hand and see if they have the same value</p>
<p>yeah you got it right</p>
<p>That's correct, simple power rule.</p>
<p>Here is the easiest way to find out if you are right for a derivative: Get a TI-89 Titanium. ;)</p>
<p>How do you do it w/ chain method?</p>
<p>Lets say we made a new variable 'u'
If -1(u)^-2
What do you do first, the -2 right?
so it will be -1/u^2
right?</p>
<p>^ wait, i don't understand what you're talking about...are you doing a different problem or the OP's problem?</p>
<p>original. but my teacher taught us the chain rule and to simplify it to make it more simple, so create new varibles. but either way, what would come first?</p>
<p>-1(u)^-2 = -1/u^2</p>
<p>thats not wat the chain rule is. chain rule is for more complex things where limit evaluation method is not feasible and power rule cannot be used. chain rule is for deriving things like (2x+3)^1/2. Outside times inside. so it becomes 1/2(2x+3) ^ -1/2 times 2. which becomes (2x+3)^-1/2</p>
<p>aa6590, I know.
I just isolated one of the questions.
Well that means I got a good grade on my quiz. yay :D</p>