what window should i use for this friggin function?

[ManBearPig]

2020 + (8)t^2

ive tried like a 1000 different windows and nothing shows up on my ti-83 plus lol. anyone!?!?!?!?

 

[Leros]

The function is going to start at 2020 and work its way up. So you could set your lower y to 2020.

 

[dennilfloss]

I read lotion instead of function.:shocked:

 

[Chaotic42]

Assuming I understand your question, I'd start my Y out at 2020. This is just going to be a horizontally squished parabola where the lowest Y is 2020.

 

[soydios]

Originally posted by: Chaotic42
Assuming I understand your question, I'd start my Y out at 2020. This is just going to be a horizontally squished parabola where the lowest Y is 2020.

concur
/thread

 

[ManBearPig]

hm what am i doing wrong here? i have:

xmin=0
xmax=2020
xscl=1
ymin=-2020
ymax=0
yscl=1
xres=1

but nothing shows up. the higher tis actually choose the right window for you

 

[Leros]

you should have :

ymin = 2020
ymax = something higher than 2020

 

[Leros]

What you are missing is how the functions are shifted

f(x) = 50 + x^2 is a parabola shifted UP by 50

f(x) = (x+50)^2 is a parabola shifted LEFT by 50

You only reverse the sign when you are shifting horizontally. To make it more obvious, take t in your function to be 0.
2020 + (8)t^2
2020 + 8*0
2020

 

[ManBearPig]

does it matter what my x-values are? this calculator sucks and i am retarded lol.

 

[jagec]

You can't expect the calculator to do everything for you...even with a TI-89, once you get into calculus you'll run into things that it can't or won't integrate. You need to use your brain as well.

Others have gotten the gist of it. One window that would work is:

xmin=0
xmax=100
ymin=2020
ymax=2020+8*(100)^2 = 82020

Pick appropriate scales.