A quadratic polynomial is a type of polynomial of degree two, which can be expressed in the standard form as $$f(x) = ax^2 + bx + c$$, where $a$, $b$, and $c$ are constants, and $a \neq 0$. In the context of complex dynamics, quadratic polynomials play a crucial role in the formation of Julia sets, as they define the behavior of iterative sequences when applied to complex numbers.
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