Why cubic?

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Why is third degree called cubic?
Why is a third degree polynomial called a cubic polynomial? I just don’t see the connection between 3 and a cube.
 

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  • #2
PeroK
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A cube is a three dimensional object. The volume of a cube is ##l^3##, where ##l## is the side length. That's cubic formula, in both senses.
 
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  • #3
russ_watters
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It's the same reason the second degree is square.
 
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Why is a third degree polynomial called a cubic polynomial?
Further, a second degree polynomial is called a quadratic polynomial because the area of a square is ##l^2##. The Latin word quadratus means "square."

Other types of polynomials have names such as quartic (fourth degree) and quintic (fifth degree).
 
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