The fourth degree for algebraic equations is the highest (ax⁴ + bx³ + cx² + dx + e = 0 and a ≠ 0) for which there is an analytical solution in radicals in a general form (that is, for any value of the coefficients). Since f (x) is a polynomial of an even degree, it has the same limit when tending to plus and to minus infinity. If a> 0, then the function increases to plus infinity on both sides, so the function has a global minimum. Similarly, if a <0, then the function decreases to minus infinity on both sides, so the function has a global maximum. This calculator will help you to solve the fourth-degree equation(quartic equation), using the Ferrari method, Biquadratic equations, etc.
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