I have a TI-83 graphing calculator and I need to graph the following function:

s(t) = -16t^2 + 80t + 7

I have no idea how to graph this on the graphing calculator. Any help at all would be greatly appreciated

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- Apr 18th 2008, 11:16 PMBostonBlazeNeed help fast: Pre-Calculus Problem
I have a TI-83 graphing calculator and I need to graph the following function:

s(t) = -16t^2 + 80t + 7

I have no idea how to graph this on the graphing calculator. Any help at all would be greatly appreciated - Apr 18th 2008, 11:17 PMMoo
Hello,

On the left and up side, you have a button "Y="

Then enter your function...

For graphing, "Graph" - Apr 18th 2008, 11:25 PMBostonBlaze
I'm sorry, I should have been a little more specific. I get to the point of entering the function and hitting graph, but it doesn't graph correctly. Do I enter the EXACT function or is it entered differently? Once you hit Y= what would you type?

- Apr 18th 2008, 11:29 PMMoo
Oh yeah I see... You have to replace t by x, since the calculator asks for a function y1(x) :) (at least, it works this way on my TI-89)

- Apr 18th 2008, 11:36 PMBostonBlaze
when I select Y= I enter the following: -16x^2 + 80x +7 then I hit graph. It's supposed to graph a half oval shap, but it graphs a straight line. Am I not enering the function correctly, even by substituting x with t?

- Apr 18th 2008, 11:45 PMMoo
Perhaps it depends on the zoom/the window...

Or try to enterCode:`-16*x^2+80*x+7`

- Apr 18th 2008, 11:49 PMBostonBlaze
It's still not working. I'm doing something wrong. Thank you so much for the help though. I really appreciate it

- Apr 18th 2008, 11:52 PMMoo
Can you tell me what's in "window" ?

And are you sure you're in the right mode for graphing ? (there is parametric, polar, etc...)

Have you ever saved x as a constant ? I mean sometimes it occurs that in programs you need to give a value to x, and that it has kept it in memory...