Calc help please

[17strcol]

I have been trying this set of problems all day and I cannot figure them out. Not asking someone to do them for me just if you could walk me through how to do one of them I could figure out the rest thank you!

 

[tkhunny]

Have you considered the Product Rule? You will need that and the Chain Rule.

 

[17strcol]

for the first one what I get for an answer is dy/dx=-(3x^2)/y

 

[17strcol]

and that is not the answer

 

[Steven G]

I'll give you and example (d/dx)(x^3*y^2) = (d/dx)(x^3)* y^2 + x^3*(d/dx)(y^2) = 3x^2*y^2 + x^3*2y(dy/dx)

 

[tkhunny]

Where is the Product Rule?

[math]\dfrac{d}{dx}x^{3}y = x^{3}\dfrac{dy}{dx} + 3x^{2}y[/math]
Whatever you did to get 'y' in the denominator, please don't ever do that again.

 

[Steven G]

for the first one what I get for an answer is dy/dx=-(3x^2)/y

Where are you getting the division by y using the product rule? If you show us your work we can help otherwise it is quite hard.

 

[tkhunny]

Just as mysteriously, whence came the negative sign? Please show ALL your work. Very hard to tell where you wandered off with no information.

 

[17strcol]

alright thank you for the help!

 

[17strcol]

alright nvm ill try the second and show work

 

[tkhunny]

alright nvm ill try the second and show work

Don't forget your Chain Rule.