Let f(3) = Using the definition of derivative at a point, f'(a) = lim enter the expression needed to find the derivative at x = 4. f(x) - f(a) - a a f'(4) = lim > 4 After evaluating this limit, we see that f'(4) 8 16 Finally, the equation of the tangent line to f(x) where x = 4 is Submit