JavaScript Quartic Equation Solver

This simple JavaScript code example can solve quartic equations in the form of ax^4 + bx+3 + cx^2 + dx + e = 0. Another way to get answers but do not want to calculate more.

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x4 + x3 + x2 + x + = 0

x1: + i
x2: + i
x3: + i
x4: + i

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