There is a typo or they are simply trying to show how to solve an equation with x in it. The equation should be [math]y^3 + py + q = 0[/math]. y is simply a translation to get the cubic to a form that is more easily dealt with.
There is a typo or they are simply trying to show how to solve an equation with x in it. The equation should be [math]y^3 + py + q = 0[/math]. y is simply a translation to get the cubic to a form that is more easily dealt with.
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