## carlenstar281 2 years ago math question help

1. aajugdar

shoot

2. carlenstar281

is the line up or down for graphing y = –2x² + 2

3. electrokid

1) this is a quadratic and cannot be a "line". It is a "curve"

4. carlenstar281

thats what i mean sorry is the curve up or down

5. electrokid

2) we then check the coefficient of the highest power of "x"

6. carlenstar281

i put it as down but im not sure

7. electrokid

it will first increase from -infinity, then reach a maximum and then decrease

8. carlenstar281

okay i get that

9. carlenstar281

so does it look like this then

10. electrokid

|dw:1364413141919:dw|

11. carlenstar281

sorry i couldn't draw it

12. electrokid

looks like this. I cannot see your picture.

13. carlenstar281

oh sorry it was a pic that looked like the one you drew except the curve was under the x axis is that correct?

14. electrokid

yep. So, it first increases and then decreases. did you study derivatives?

15. carlenstar281

yes and thank you :)

16. cahit

curve is under the x axis and downward.. at x = 0 it peak

17. cahit

at y =0 you can find x value and at x= 0 find value of y...

18. electrokid

if you had studied derivatives, this becomes way easier

19. carlenstar281

just a little bit and thank you again all for helping