5 Use Descartes's rule of signs to determine the possible number of positive and negative real...

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5 Use Descartes's rule of signs to determine the possible number of positive and negative real zeros of f(x)=x -X -x+x3 By Descartes's rule of signs, the possible number of positive real zeros is (Use a comma to separate answers as needed.) x+x+1. Verify your result by using a graphing utility to graph. 5 Use Descartes's rule of signs to determine the possible number of positive and negative real zeros of f(x)=x -X -x+x3 By Descartes's rule of signs, the possible number of positive real zeros is (Use a comma to separate answers as needed.) x+x+1. Verify your result by using a graphing utility to graph.