Asked by alexis
How would you work out when this function turns and goes in a different direction? (like a turning point for a parabola):
s=0.2t(t-5.1)(t-9.1)
s=0.2t(t-5.1)(t-9.1)
Answers
Answered by
bobpursley
it will be halfway between the roots, or
turning point is when tis halfway between 5.1 and 9.1, or t=7.1. Put that into the s equation, and solve.
turning point is when tis halfway between 5.1 and 9.1, or t=7.1. Put that into the s equation, and solve.
Answered by
Steve
since it's a cubic, it's hard to do without calculus.
The easiest way is to examine its graph.
http://www.wolframalpha.com/input/?i=0.2t%28t-5.1%29%28t-9.1%29
Looks like t≈2.1 or 7.4
The easiest way is to examine its graph.
http://www.wolframalpha.com/input/?i=0.2t%28t-5.1%29%28t-9.1%29
Looks like t≈2.1 or 7.4
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