Find f'(x) by evaluating lim h->0 (f(x+h) - f(x))/h when f(x) is given as follows: f(x) = sqrt(2x+5). Given the function f(x) = 3x^2 - 5x + 1. (a) find the slope of the secant line through the points (2,3) and (3,13). (b) find the equation of the tangent line to the parabola y = f(x) at the point (2,3). slope of tangent line is f'(2) = lim h->0 (f(2+h) - f(2))/h