## iwanttogotostanford one year ago Determine

1. iwanttogotostanford

@Vocaloid

2. iwanttogotostanford

|dw:1443540278601:dw|

3. iwanttogotostanford

thats a parabola sorry it was hard to draw

4. iwanttogotostanford

@Nnesha @pooja195

5. iwanttogotostanford

6. Nnesha

$\huge\rm y=a(x-h)^2+k$ vertex form where (h,k) is the vertex point so substitute (h,k) for (-2,-4)

7. iwanttogotostanford

I did that and i got y=a(x+2)^2-4 @Nnesha

8. Nnesha

right the leading coefficient makes the graph wider or skinnier or turn up and down (depends on the sign ) if a is negative then it opens down

9. iwanttogotostanford

but i am confused on which one my answer will be

10. iwanttogotostanford

@Nnesha

11. Nnesha

why ?? you already got the equation

12. iwanttogotostanford

I'm thinking A?

13. Nnesha

14. Nnesha

why A ?

15. iwanttogotostanford

because where does the "a" i the equation go? and then how do i tell if it is negative or not

16. iwanttogotostanford

because i got y=a(x+2)^2-4 and the closest one to that is A

17. Nnesha

$\huge\rm y=a(x-h)^2+k$ vertex form a outside the parentheses

18. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @Nnesha right the leading coefficient makes the graph wider or skinnier or turn up and down (depends on the sign ) if a is negative then it opens down $$\color{blue}{\text{End of Quote}}$$ read this

19. iwanttogotostanford

but its going up?

20. iwanttogotostanford

but it opens down...

21. Nnesha

$$\color{blue}{\text{Originally Posted by}}$$ @iwanttogotostanford because i got y=a(x+2)^2-4 and the closest one to that is A $$\color{blue}{\text{End of Quote}}$$ right you got this now look at first option both are the same or not ?

22. iwanttogotostanford

no, because it i missing the A

23. Nnesha

well look at option A there is +4 but in ur equation it's -4

24. iwanttogotostanford

ah ok so it would be option D @Nnesha

25. Nnesha

yes right and bec the graph opens down that's how there is negative sign

26. iwanttogotostanford

okay, thank you

27. Nnesha

|dw:1443541832026:dw|

28. Nnesha

np

29. iwanttogotostanford

can i ask you another graph question with a new problem please?

30. Nnesha

i'll try not sure i'm not good at graphing stuff