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2x2-x-6 (a) limx-2 x-2 (b) limx- .; x-5 5x-2 (c) limx-0 (x+8)3-2 X 2. [6 Marks]. Determine the slope of the tangent to the curve of f (x) = 2_1 X - at x = 4. 3. [6 Marks]. Determine constants a and b such that f (x) is continuous for all values of X. ax +b, if x 5 4. [10 Marks]. (a) Sketch the graph of the following function. x+3, if x