How do you differentiate #f(x)=sqrt30#?
If we consider that for any constant ( a value that does not contain some variable) that comprises a function that is to be derived, that constant is eliminated in the derivation process.
As such, if we consider the general parabolic function;
Its derivative may be expressed as;
Note that the constant has been eliminated from the expression - effectively giving it a value of zero.
Thus, graphically, as