A real world example of a cubic function might be the change in volume of a cube or sphere, depending on the change in the dimensions of a side or radius, respectively.
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Cubic functions are used in various real-life applications, such as modeling the volume of a cube, predicting the growth of certain biological organisms, or analyzing the behavior of certain physical systems. In engineering, cubic functions can be used to describe the relationship between variables in complex systems, such as fluid dynamics or structural mechanics. Additionally, cubic functions are often utilized in economics to model demand and supply curves, as well as in finance for analyzing investment returns over time.
For someone packing whole house the cubic function is important to factor the amount of storage needed to move a home. Another real application would be in manufacturing and filling a box with product.
There are no real life applications of reciprocal functions
They are both polynomial functions. A quadratic is of order 2 while a cubic is of order 3. A cubic MUST have a real root, a quadratic need not.