I assume you are taking the derivative with respect to x? If so you need to use the chain rule, i.e. .
To start you off
Also, if then
I hope that helps.
you don't need to do it like that... (i assume that your last " y' " is derivated by the x ) it's much easier (for more complex problems) to just get the constant (in this case y) out ...
is being used for derivate something like this (where are two functions )
that what you did there is like that for (2x^2) for derivate on "x" you do that's to much work to be done, especially when we have constant on our hands
sorry i don't have intention to be rude or something but to do derivation of function and constant like derivation of two functions ... that's not wrong but not needed at all