## anonymous 5 years ago Use the quadratic formula to find the x-intercepts of the function. Round to the nearest tenth if necessary. y = -2x2 + 5x - 1 A. {2.3, 0.2} B. {2.2, -5.8} C. {-9.2, -0.8} D. no real solution

1. anonymous

$\frac{5\pm\sqrt{17}}{4}$

2. anonymous

3. anonymous

Hmmm alright (: Thanks!!!

4. anonymous

Can you help me on like my last 6 questions?

5. anonymous

i just computed first by quadratic formula, then plug in to calculator

6. anonymous

ok shoot

7. anonymous

pleaseeeeee? u dont have to.. but i would like it!

8. anonymous

i am ready, lets do it.

9. anonymous

Solve, using the square root method: 5x2 = 60. Round the solution to the nearest tenth. A. {3.5, -3.5} B. {7.7, -7.7} C. {3.5} D. No real solution

10. anonymous

(: So generous!! :D

11. anonymous

3.5, -3.5

12. anonymous

5 to go

13. anonymous

A?

14. anonymous

A

15. anonymous

Okay next one Solve using the square root method. Round to the nearest tenth if necessary. x2 + 15 =0 A. {3.9} B. {3.9, -3.9} C. {7.5, -7.5} D. no real solution

16. anonymous

no real solution since $x^2=-15$ has no real answer

17. anonymous

4 to go

18. anonymous

OKay so D Next one Which number completes the perfect square trinomial? x2 + 20x + ? A. 40 B. 100 C. 25 D. 80

19. anonymous

100

20. anonymous

(:

21. anonymous

half of 20 is 10, 10 squared is 100

22. anonymous

3 more

23. anonymous

Okay (: Use the quadratic formula to solve the problem. A soccer player throws the ball onto the field from the sideline. An equation modeling the ball's flight is h = -16t2 + 18t + 2. In how many seconds will the ball reach the ground? A. in about 2 seconds B. in about 1.2 seconds C. in about 1.8 seconds D. Cannot be determined

24. anonymous

set $-16t^2+18t+2=0$ solve for t

25. anonymous

B

26. anonymous

27. anonymous

Haha yea alright (: Thanks soooo much btw (: Next.. Which of the following shows the square completed in the this equation? x2 + 3x - 5 = 0 A. (x + 9)2 = 14 B. (x - 3)2 = 8 C. (x + 1.5)2 = 7.25

28. anonymous

this is nonsense by the way unless he throws it straight up in the air. if he throws it out on the field equation makes no sense

29. anonymous

C

30. anonymous

Yea... thats true!!

31. anonymous

one more?

32. anonymous

2 more! here they are Solve the following using the quadratic formula. Round to the nearest tenth if necessary. 2x2 + 9x + 4 = 0 A. {-4, -0.5} B. {-16, -2} C. {-8, -1} D. no real solution Use the quadratic formula to find the zeros of the function y = 2x2 + 3x + 6. Round to the nearest tenth if necessary. A. {-1.7, 2.3} B. {-2.4, 2.4} C. {-2.3, 0.8} D. no real solution

33. anonymous

ohh u dont have to do the last one then if u dont want to (:

34. anonymous

35. anonymous

first one is A, -4 and -.5

36. anonymous

no problem we do the last one now

37. anonymous

Okay (:

38. anonymous

ahww thanks!! =3

39. anonymous

no solution

40. anonymous

OKay (: OMFG i could seriously stalk you right now!!! (lmfao) I got another 100% I am totally getting it back to a B!!!! And its all thanks to youuuuuuuuu!!! <3

41. anonymous

are you taking this on line?

42. anonymous

Yep!! (; Haha

43. anonymous

way to go!

44. anonymous

Its hard as hell!!!

45. anonymous

46. anonymous

and now i am done for the evening. gnight!

47. anonymous

Ikr!! haha i usually get those ppl who only want metals :P And they give me wrong answerssss..... and okay thanks sooooooooooooooooooooo much!!!!!! (: Hope i see u again!! (:

48. anonymous

ok maybe tomorrow.

49. anonymous

very welcome.

50. anonymous

(:

51. anonymous

:)

Find more explanations on OpenStudy