Let f(1) = 512 + 101 - 4. Using the definition of derivative, f'(I) = lim f(I + h) - f(I) h-+0 h enter the expression needed to find the derivative function. f'(x) = lim h-+0 After evaluating this limit, we see that f' (I) = df di Finally, the equation of the tangent line to f(r) where I = 3 is