tinyboy21 Posted May 31, 2005 Share Posted May 31, 2005 How do you find the vertex of a parabola using the calculator? Link to comment Share on other sites More sharing options...
Dave Posted May 31, 2005 Share Posted May 31, 2005 Personally, I would plot it and observe where the point is Link to comment Share on other sites More sharing options...
tinyboy21 Posted May 31, 2005 Author Share Posted May 31, 2005 sure Link to comment Share on other sites More sharing options...
ydoaPs Posted May 31, 2005 Share Posted May 31, 2005 find where the first derivative = 0. i think you may have seen it as -b\2. Link to comment Share on other sites More sharing options...
Dave Posted May 31, 2005 Share Posted May 31, 2005 Doesn't really help much if the person in question hasn't touched differentiation As I said, plotting it will show you where the minimum point is. The other (slighty more) mathematical way of doing it is to work out where a line of zero tangent intersects the curve. And, of course, there's calculus if you've done that kind of thing already. Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted May 31, 2005 Share Posted May 31, 2005 Hit 2nd TRACE. If the parabola's vertex is at the bottom, hit "minimum" and if it's at the top, hit "maximum." Now it will ask you for a left bound. Arrow over to the left of the vertex and hit enter. Now it asks you for right bound; move to the right of the vertex and hit enter. When it asks for a guess, just hit enter where you think the vertex is. Voila, it spouts out the vertex. Link to comment Share on other sites More sharing options...
tinyboy21 Posted May 31, 2005 Author Share Posted May 31, 2005 alright, thanks all. Link to comment Share on other sites More sharing options...
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