Kinematics position function question

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CuelloFactor
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I'm studying for AP test. This is not a homework question. Does anyone know how to do number 2? I don't even know where to start. I tried factoring out t and using quadratic formula, but I kept getting imaginary roots and t can't equal zero.

X = (t^3 - 3t^2 + 6t)m

where m is meters and t is seconds.
What is the position of the particle when it is at its minimum speed (after t = 0)

thanks in advance for anyone that answers.
 

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