Book:Murray R. Spiegel/Mathematical Handbook of Formulas and Tables/Chapter 9/Quartic Equation

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Quartic Equation $x^4 + a_1 x^3 + a_2 x^2 + a_3 x + a_4 = 0$

Quartic Equation
$9.6$, $9.7$: Ferrari's Method
$9.8$: Viète's Formula for Quartic Equation