1. shaleiah

@Nnesha Did I graph these 3 points, right?

2. Nnesha

hmm $\huge\rm y=a(x-h)^2+k$ vertex form of parabola where (h,k) is the vertex point and find x and y intercepts

3. Nnesha

x-intercept is a point where line intersect x-axis when y=0 so substitute y for 0 to find x intercept y-intercept is a point where line intersect y-axis when x=0 so substitute x for y to find y-intercept

4. shaleiah

The vertex is (4,1)

5. Nnesha

right

6. shaleiah

what are the next steps?

7. Nnesha

alright and bec a is negative in the question so we would get max point (graph opens down)

8. Nnesha

so max would be at ((4,1) |dw:1443814926678:dw|

9. Nnesha

now find x intercept

10. Nnesha

hmm highest degree is 2 so you should get 2 xintercepts 4 isn't correct

11. shaleiah

okay, (9,7)

12. Nnesha

hmm how did you get that ?

13. shaleiah

I graphed it on my calculator

14. Nnesha

hmm make sure you typed the correct equation

15. shaleiah

Alright, I got x=0 and y=-63

16. Nnesha

yeah that's y-intercept now substitute y for 0 to find x-intercept

17. Nnesha

let me know if u don't know how to solve for x

18. shaleiah

(0,-1)

19. shaleiah

help

20. Nnesha

alright wait a sec

21. Nnesha

$\huge\rm 0=-4(x-4)^2+1$ do you know the quadratic formula ?

22. Nnesha

(x-4)^2 is same as (x-4)(x-4) foil it

23. Nnesha

familiar with the foil method ?

24. Nnesha

25. Nnesha

make sure you are looking at the right question

26. shaleiah

(0,16)

27. Nnesha

i have no idea how u got that please show some work we need x intercepts when y =0

28. shaleiah

-sighs- I typed it in my calculator. (x-4)^2 and graphed, it showed x=0 and y=16

29. Nnesha

hmm well ur equations is -4(x-4)^2 +1 that's what u should type into the calculator

30. shaleiah

lots of step lol

31. shaleiah

steps*

32. Nnesha

will if you want to solve by hand to find x-itnercepts then yes there are lots of steps if you want to use calculator then there are none

33. Nnesha

well* ...

34. shaleiah

Alright, I typed it in. Graphed. X=0

35. Nnesha

lol i was about to post ur question on others thread :D

36. shaleiah

I'm sorry, I am not that good at math, I'm barely on an intermediate level.

37. Nnesha

or here is another way to graph x-coordinate of vertex is 4 right so draw a table |dw:1443819080897:dw| now substitute those points to find y coordinate

38. Nnesha

no i have so man tabs open so that's why

39. Nnesha

many*

40. Nnesha

do you understand that ?

41. Nnesha

don't need to find x-intercepts just substitute x for the points in the table that's it

42. shaleiah

Okay

43. shaleiah

@Nnesha

44. Nnesha

vertex is max point min = minimum max = maximum |dw:1443820566646:dw|

45. Nnesha

|dw:1443820718145:dw| if the vertex is at (4,1) that would be the maxx point

46. Nnesha

|dw:1443820739973:dw| this point should be the max that's why to find other two points we should go up 2 and down 4 from the x-coordinate of the vertex

47. Nnesha

|dw:1443820778704:dw| use this table substitute x for its value from the table then solve for y