Ch. 3 5 . Use the limit method to find the slope of the tangent line to the graph of y = f(x) at x=a. Then find the equation of this tangent line. f (x) = V2x+ 1atx=4 6. Differentiability Explain why each of the following functions is or is not differentiable at the given point a. f(x) = Vx- 1atx =1 b. g (x) = (xz - 3x+ 3, x52 atx= 2 lex-2 x >2