Plural of cubic; refers to cubic equations, cubic curves, or cubic geometric shapes in mathematics.
From 'cubic' (relating to cubes or third-degree polynomials) plus plural '-s.' In algebra, 'cubics' specifically denotes equations of the third degree.
Cubic equations were the first 'unsolvable' problems that mathematicians actually solved—for centuries people believed you couldn't solve them algebraically like quadratics, until Italian Renaissance mathematicians proved everyone wrong.
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