A electron moving along the x axis has a position given by x = 20 te-1.4 t m, where t is in seconds. How far i?

A electron moving along the x axis has a position given by x = 20 te-1.4 t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?
Update: X = 20 te^-1.4t
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