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7. Show that the following functions are not differentiable at x = 0. (a) f (20) = 1201 = 3 x 20 -x x0 8. *(=) Find the equation of the tangent line to the following functions at the point (a, f(a)) if: (a) f(x) = 2x2 + 10x, a =3 (b) f(2) = x-1, a=8 (c) f(ac) = 1, a=-2 (d) f(ac) = Vac+4, a=1=D (e) f(ac) = , a=4 9. State whether the inequality (for all a in the domain) provides sufficient information to determine limx-1 f(x) and, if so, find the limit.]] Hint: Squeeze/sandwich theorem (a) 4x - 5