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Extra Credit Part (a) Show that every cubic equation of the form x + bx + c = 0 where b and c are real

Extra Credit Part (a) Show that every cubic equation of the form x + bx + c = 0 where b and c are real numbers has at least one root. Part (b) Show that every point (b, c) in the plane lies on a tangent line to the graph of y=x

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