gradarius Home Report an issue Help The point on a curve where y = 0 Correct! A derivative is the slope of the curve at a given point, measuring the instantaneous rate of change at that point. In order to evaluate the limit, you need to cancel common terms (like Use the definition of the derivative to compute f (x) = x2- 4. x2 - x2), and cancel factors of h. Rewrite the limit after totally simplifying the expression inside the limit. (Make sure the expression is inside parentheses.) lim ( x+ h ) 2 - 4-1(x) v lim ( x + h) 2 - 4 - (x2 -4) lim x2 + 2.x. h+ 12-4- (x2-4) h -+0 h = h -+0 h h -0 h