Question

f(x)+3x^2-4 using the derivative def

Answer 1

Sorry, could you clarify your question?

Answer 2

using the derivative definition: f(x+h) - f(x)/ h find the derivative of f(x)=3x^2-4

Answer 3

Sure, so you're literally doing just that and finding the limit as h approaches 0. Aside from the limit you are just doing normal algebra.