Roots of quartic equation

Hello! I need to write a function which helps finds the roots of a quartic function (in the form Ax4 + Bx3 + Cx2 + Dx + E = 0) I have the values for A-E in a vector. I'm stuck.. Thank you!

Here you go: https://upload.wikimedia.org/wikipedia/commons/9/99/Quartic_Formula.svg

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