4. Let f be the function defined as follows: [lx-31 + 1, ax + bx, f(x)...

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4. Let f be the function defined as follows: [lx-31 + 1, ax + bx, f(x) = {1x x < 3 x = 3 (a) If a = 3 and b = 2, is f continuous for all x? Justify your answer. (b) Describe all values of a and b for which f is a continuous function. 4. Let f be the function defined as follows: [lx-31 + 1, ax + bx, f(x) = {1x x < 3 x = 3 (a) If a = 3 and b = 2, is f continuous for all x? Justify your answer. (b) Describe all values of a and b for which f is a continuous function.