How do i Rearranging Equations/formula?

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Homework Statement


how would you rearrange this d=v1(t)+ 1/2a(t)^2 for time?


Homework Equations





The Attempt at a Solution


my friend told me it was "-2-v1/a =t" but i don't this is right and if it is right how did he get this?
 
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This is a quadratic equation. Use the quadratic equation formula.