Answer:
±sqrt( (vf) ^2 -2ad)) = vi
Step-by-step explanation:
(vf) ^2 = (vi)^2 +2ad
Subtract 2ad from each side
(vf) ^2 -2ad = (vi)^2 +2ad -2ad
(vf) ^2 -2ad = (vi)^2
Take the square root of each side
±sqrt((vf) ^2 -2ad)) = sqrt((vi)^2)
±sqrt( (vf) ^2 -2ad)) = vi
