## byndbtch 3 years ago ax^2+bx+c<0 anyone have a clue as I dont!!

1. Mertsj

What are you supposed to do?

2. byndbtch

solve the equation or inequality???

3. byndbtch

there is a graph with it and I am so lost.....

4. byndbtch

I had ax^2+bx+c=0 and got that one, I think but this????

5. Mertsj

You need to post the entire problem including the graph. The only thing you posted in the general quadratic inequality. Its solution depends entirely upon the values of a, b, and c.

6. byndbtch

I know right....ok hang on. But I dont no how to post a graph??

7. Mertsj

Well then, you could tell what its shape is (I'm assuming it's a parabola), tell if it is concave upward or downward and give its vertex and x intercepts (if any). That would give us a pretty good idea of the problem.

8. byndbtch

it is upward, the vertex is 6.5 and -4 and 4 does that help

9. byndbtch

the vertex is -6

10. Mertsj

|dw:1349043948873:dw|

11. Mertsj

Does it look like that?

12. byndbtch

kinda but the vertex ir right in the middle.....it points upward at -4 on the left and 4 on the right

13. Mertsj

So the vertex is on the y axis?

14. byndbtch

yes

15. Mertsj

And it crosses the x axis at (4, 0) and (-4,0)?

16. byndbtch

yes

17. byndbtch

|dw:1349044244497:dw|

18. byndbtch

more like that

19. Mertsj

|dw:1349044229220:dw|

20. byndbtch

exactly!!

21. Mertsj

Now exactly what does the problem say to do?

22. byndbtch

The graph of y=ax^2+bx+c solve each equation . ax^2+bx+c=0 ax^2+bx+c<0 ax^2+bx+c>0

23. Mertsj

There must be more because what you posted doesn't make sense.

24. byndbtch

I know!! that is exactly as it is posted.

25. byndbtch

my options for the second equation are like 7 choices...makes no sense to me??

26. Mertsj

Does it say "The graph of y = x*2+bx+c is shown"?

27. byndbtch

YES

28. Mertsj

Ok. Now. I repeat my original request. Please post the problem EXACTLY as shown.

29. byndbtch

the graph of y=ax^2+bx+c is given below. Solve each equation or inequality. ax^2+bx+c=0 ax^2+bx+c<0 ax^2+bx+c>0

30. byndbtch

the vertex is not the -6 it is -30!!!!

31. byndbtch

its -32

32. byndbtch

I just seen that......does that help any???

33. Mertsj

What are the x intercepts?

34. byndbtch

they are the same

35. byndbtch

-4 4

36. Mertsj

Are you sure?

37. byndbtch

yes

38. byndbtch

|dw:1349045608333:dw|

39. Mertsj

Then plug into the equation y = a(x-h)^2 +k and find the value of a

40. Mertsj

Then solve the resulting inequality.

41. byndbtch

that is where I am confused....plug what numbers? and plug them in as a????

42. Mertsj

(h,k) is the vertex which in your case is (0,-32) You are given the x intercepts. Choose one of them, perhaps (4,0). Replace x with 4 and y with 0 and solve for a.

43. byndbtch

ok I will try. thx

44. Mertsj

yw