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Find the absolute maximum and minimum values of f(x)= −x^3−3x^2+4x+3, if any, over the interval (−∞,+∞)(−∞,+∞)....

Find the absolute maximum and minimum values of f(x)= −x^3−3x^2+4x+3, if any, over the interval (−∞,+∞)(−∞,+∞).

I know it doesn't have absolute maxima and minima but where do they occur? In other words x= ? for the maxima and minima?

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