SOLUTION: The distance traveled by an object moving in a straight line is given by S= t^2-2t, where S is in feet and t is the seconds the object has been in motion. How long (to the nearest

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Question 292941: The distance traveled by an object moving in a straight line is given by S= t^2-2t, where S is in feet and t is the seconds the object has been in motion. How long (to the nearest tenth) will it take the object to move 15 ft
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
When does S(t)=15?
t%5E2-2t=15
t%5E2-2t-15=0
%28t-5%29%28t%2B3%29=0
Two solutions:
t-5=0
t=5
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t%2B3=0
t=-3
Since t represents time, a time of -3 seconds doesn't make sense for this problem.
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highlight%28t=5%29