SOLUTION: Please help me solve this equation, by solving for t. {{{d=vf t - (1/2) a (t)^2}}}

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Question 789312: Please help me solve this equation, by solving for t. d=vf+t+-+%281%2F2%29+a+%28t%29%5E2
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
d=v%5Bf%5D+t+-+%281%2F2%29+a+t%5E2
2d=2v%5Bf%5D+t+-++a+t%5E2
at%5E2-2v%5Bf%5D+t%2B2d=+0+
Using the quadratic formula:
t+=+%282v%5Bf%5D+%2B-+sqrt%28%282v%5Bf%5D%29%5E2-4%2Aa%2A%282d%29+%29%29%2F%282%2Aa%29+ ---> t+=+%282v%5Bf%5D+%2B-+sqrt%284v%5Bf%5D%5E2-8ad+%29%29%2F%282%2Aa%29+