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## anonymous 5 years ago how can i solve a quadratic equation like this 6x^2-5+x=0

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1. anonymous

rewrite it in the normal form and plug into the quadratic equation: $ax^2 + bx + c = 0 \implies x = \frac{-(b) \pm \sqrt{(b)^2-4(a)(c)}}{2(a)}$

2. anonymous

thank you i did that part but where i am getting cofused at is that addition/ subtraction sign i dont kno what to do with it sorry i didnt say that earlier

3. anonymous

Oh, well unless the part under the square root is 0 you will get 2 different possible solutions. $x = \frac{-(b) + \sqrt{(b)^2-4(a)(c)}}{2(a)}$ and $x = \frac{-(b) - \sqrt{(b)^2-4(a)(c)}}{2(a)}$ The $$\pm$$ thing just makes it easier to write.

4. anonymous

oh ok thank you i'ma try it now :D

5. anonymous

HOW WOUD I GET THAT SQUARE ROOT SYMBOL ON THE CALCULATOR

6. anonymous

It should have it. If not you can raise it to the .5 power.

7. anonymous

LIKE THIS (1^2-4(6)(-5)^5

8. anonymous

it gave me some crazy number how would you do it i guess i was wrong

9. anonymous

i got 2.59374246E10

10. anonymous

Not quite. What do you have before you plug it in?

11. anonymous

i did 1^2-4(6)(-5) and i recieved 121 but then i raised that to the 5th power and i got that wierd number

12. anonymous

but then instead of that i subtracted -5 then i divided by 12 and i got 10.5

13. anonymous

?

14. anonymous

why did you raise to the 5th. I said .5 or 0.5 or 1/2

15. anonymous

that's probably the issue.

16. anonymous

i still dnt get it i'm sorry for wasting your time!

17. anonymous

Your calculator doesn't have a square root button?

18. anonymous

it does but it is a blue sign above the X^2 button i cnt seem to get the sign but i always get the X^2

19. anonymous

?

20. anonymous

What kind of calculator do you have

21. anonymous

a TI-84 PLUS SILVER ADDITION

22. anonymous

Do you see the blue func button? Press that first, then press the x^2 button.

23. anonymous

err should say 2nd on it.

24. anonymous

I GOT IT! yah thanx yu

25. anonymous

i got a -48

26. anonymous

The square root of 121 is 11

27. anonymous

So you should have $x = \frac{-1 \pm 11}{2(6)}$

28. anonymous

i feel so dum sorry!

29. anonymous

sorry

30. anonymous

hrm?

31. anonymous

i got 32and -34 do i put down both of my answers

32. anonymous

How do you get that?

33. anonymous

-1 + 11 = 10 -1 - 11 = -12 So you should have 10/12 and -12/12 = -1

34. anonymous

omg! im sorry but im dne i cnt do this!

35. anonymous

I don't understand what's confusing you.

36. anonymous

If you can explain I can try to help.

37. anonymous

i just dont know how to do this im basically confused about evrything i dnt know what else to do

38. anonymous

Well hang on.

39. anonymous

Can you simplify the expression $\frac{4+3}{8}$

40. anonymous

7/8

41. anonymous

1.142857143?

42. anonymous

no im sorry 7/8

43. anonymous

u k i have no idea wat ur sayin im in 5th grade '

44. anonymous

?

45. anonymous

Yes, 7/8 is correct

46. anonymous

Now try this one: $\frac{4-3}{2(4)}$

47. anonymous

polpok ur awesome

48. anonymous

heh, thanks.

49. anonymous

np

50. anonymous

When working with fractions like this, just try to simplify the top and bottom separately.

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