14 Given f'(-1) = lim (h2 - 2h) - 0 h-+0 h , which one of the following is f(x) ? Select one alternative: O x2 - 1 Ox+1 O:23 - 1 O x2 - 2x +.1 15 Consider a differentiable function f(a) = a" + axt . It has a derivative given by f'(x) = 3x2 + 2x-7. Which one of the following options gives the values of a and b ? Select one alternative: Oa= b = 4 Oa =3 b = 2 Oa=1 b= 2 Oa = 4 b = 2 16 Which one of the following is the gradient of the line that is tangent to the point (2, 5) on the graph of 1 y = -2' + 1? Select one alternative: O 1 / CO 06 03