When examining the graph of a cubic polynomial function, how can you determine if all of the zeros are real?

Solution:

Consider, the Cubic polynomial :

f(x)=  

Draw , the graph of cubic polynomial on two dimensional coordinate plane, and find number of times it cuts the x axis.The point where it cuts the x axis,are the roots of the cubic polynomial function or  number of real roots that a cubic polynomial function possess is number of times it cuts the x axis.

Keep in mind, Imaginary root occur in pairs.

So, a cubic polynomial function has all real root , a single real root or no real root.

So, if graph cuts the x axis at three points (Either same or different) , showing the number of real roots possessed by the cubic polynomial function.

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step-by-step explanation: