# Rearranging equations.

1. Oct 7, 2009

### einsteinette

1. The problem statement, all variables and given/known data

Rearrange d=vit + 1/2 at^2 for t.

3. The attempt at a solution

t = \frac{-v \pm \sqrt{v^2+4 \left( \frac{1}{2} a\right)d}}{2 \left( \frac{1}{2} a \right)}

2. Oct 7, 2009

### Delphi51

Very hard to read that - but it looks pretty good. I get
t = (-Vi + sqrt(x))/a or (-Vi - sqrt(x))/a
where x = Vi^2 + 2*a*d
I've never seen that formula used - it is just easier to use two of the others to do the job.