Question

how do i make Y=74735x+5096883 in to a quadratic function? I'm so lost and i need to do this for a project...

Answer 1

well, I guess I don't get your question here

Answer 2

Do you just mean you want y^2 and x^2? That's not what a quadratic is, but It's the only thing you could get in that situation

Answer 3

I suppose so. The directions dont really explain what to do.

Answer 4

Can you give me a better copy of the directions?

Answer 5

Place a screenshot of your scatter plot, displaying the quadratic regression curve, regression equation, and coefficient of determination, next to Plot.

Those are the directions, but i cant get the graph without the function. can I?

Answer 6

Did you get that equation by a regression curve on excel?

Answer 7

no. on the TI-84 graphing calculator

Answer 8

Oh, ok. I don't have a TI-84, so I'm not sure about that, but on excel there is a button to click to make a quadratic regression curve instead of linear.

Answer 9

really? where is that? I dont use excel much/

Answer 10

You put your data in to excel. Then highlight it and click insert/scatterplot

Answer 11

Then right click on the scatterplot data, and add trendline

Answer 12

Choose polynomial order 2. And click the check box of display equation on chart.

Answer 13

And click the box, display R squared value on chart

Answer 14

Make sense?

Answer 15

yes. SOOOO much more than just being dropped in. Thank you so very much. Is it the same with exponential function/ models?

Answer 16

Yep. Just click the exponential button instead of polynomial

Answer 17

And you are very welcome. :-)

Answer 18

Nice catch Joanna!

Answer 19

Thanks, @FibonacciChick666 !

Answer 20

um ok one more thing. or maybe three because they are for different equations, but how do i know that the line is correct for the graph?


this is the second part of the instructions: Replace [Discussion] with your discussion about how well the linear model fits the data

Answer 21

@JoannaBlackwelder @FibonacciChick666

Answer 22

sorry to keep bothering you two. but you guys help me in a way i can actually understand

Answer 23

The closer the R squared value is to 1, the better the fit is.

Answer 24

It's just asking you to look at the quadratic line that was of best fit and see if it is close to the actual graph. If it is a good estimation

Answer 25

ohh ok. I see. thats what the R squared is for. alright thank you guys so much. that should be all i have. Thank you thank you thank you :)

Answer 26

You're welcome :D

Answer 27

np best of luck

Answer 28

xc sadly now i have to predict what the population will be in 20 years. and i have to use the equation y =74735x+5E+06... any pointers perhaps

Answer 29

Hint: what does each variable represent in your function?

Answer 30

umm.. x is going to be the independent variable. But i have no idea where E came from

Answer 31

what does the independent variable represent though

Answer 32

it represents time

Answer 33

ok. i did it. Thank you both again so much

Answer 34

that's what I was looking for. np