Sextic equation

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In mathematics, a sextic equation is a polynomial equation of degree six. It is of the form:

<math>ax^6+bx^5+cx^4+dx^3+ex^2+fx+g=0,,</math>


where <math>a neq 0.</math>

The coefficients a, b, c, d, e, f, g are members of a field, (typically the rational numbers, the real numbers or the complex numbers), and <math>a neq 0.</math>

Because they have an even degree, normal sextic functions appear similar to normal quartic functions when graphed, except they may possess an additional local maximum and local minimum each. The derivative of a sextic function is a quintic function.

Since a sextic function is a polynomial with even degree, it has the same limit when the argument goes to positive or negative infinity. If a is positive, then the function increases to positive infinity at both sides; and thus the function has a global minimum. Likewise, if a is negative, it decreases to negative infinity and has a global maximum.

Another name for a sextic equation is a hexic equation.

Solvable sextics

Some sixth degree equations can be solved by factorizing into radicals, but other sextics cannot. √Čvariste Galois developed techniques for determining whether a given equation could be solved by radicals which gave rise to the field of Galois theory.

It follows from Galois theory that a sextic equation is solvable in term of radicals if and only if its Galois group is contained either in the group...
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