x 2 XSI 5. The graph of f(x) = 3 x2 -2x-1, 1

x2 2xI, I < x < 3 is given by the graph at below. 5. The graph of f(x) x 23 4, (a) Find a number b such that f(x) is continuous in (co,b] but not in (m,b+ l). (b) Find all numbers a and b such that f(x) is continuous in (a,b) but not in (a.b]. (c) Find the least number a such that f(x) is continuous in [a.@).