Let f be the function defined as follows. x³ 2x+3, x<1 3ax²+x, x≥ 1 f (x) = Is f continuous at x= -3? Explain. Is f continuous at x=4? Explain. Find a so that fis continuous on the whole real line.

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A: To verify that whether Rolles  theorem can be applied to f on the closed interval [a,b]

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