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F of x equals x cubed is the simplest cubic function that I can think of. Since
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in order to be a cubic polynomial, an expression must have at least one term
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that's of degree 3, and that must be the term with the highest degree. This
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certainly does seem like the simplest cubic function we can come up with. It's
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just x multiplied by itself three times. Now, because this function is so basic,
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so primary, this gets a special name, a special designation, of being called the
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parent function for cubics. Just like f of x squared is the parent function for
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quadratics.