## anjum1 2 years ago whose product is+15 and whose sum is -8???

1. erdog82

Ok, so when you multiply two negatives it equals a positive, right?

2. anjum1

yeh

3. erdog82

So, then how do you get 15 when multiplying 2 negative numbers?

4. anjum1

no that is the question

5. erdog82

Okay, how do you get 15 when multiplying 2 positive numbers?

6. anjum1

5*3

7. erdog82

So, since a negative times a negative is a positive, what are the numbers now?

8. anjum1

thank you

9. erdog82

10. erdog82

And so, -5x-3= 15 and -3+-5= -8 !!

11. erdog82

Is that all you need help with?

12. anjum1

whose product is -6 and whose sum is +1

13. anjum1

3*2

14. anjum1

thanks you done it again

15. erdog82

okay, so if you want those 2 numbers to have a sum of 1, which number do you turn negative?

16. anjum1

2

17. erdog82

good!

18. erdog82

so -2x3 = -6 and -2+3 = 1

19. anjum1

whose product is -12 and whose sum is -4

20. erdog82

How can you get 12 when multiplying 2 positive numbers?

21. anjum1

3*4

22. erdog82

well, that and 2x6

23. anjum1

thanks

24. erdog82

So, which number do you turn negative to get a sum of -4?

25. anjum1

-6

26. erdog82

Good!

27. anjum1

whose product is -12 and whose sum is -4

28. anjum1

sorry wrong one

29. anjum1

whose product is -16 and whose sum is 0

30. erdog82

How do you get 16 when multiplying 2 positive numbers (that are the same) ?

31. anjum1

4

32. anjum1

thank you

33. erdog82

Now you need to make 1 negative, and if you add -4 +4 what do you get?

34. anjum1

0

35. anjum1

36. erdog82

0

37. anjum1

okay thank you but it says sum doesnt that matter

38. erdog82

39. erdog82

So it doesn't matter, but adding a negative is like subtracting a positive!

40. anjum1

doesnt it not count as minus (because i heard my teacher say something like that)

41. anjum1

okay

42. anjum1

okay next q

43. erdog82

What grade are you learning this in?

44. anjum1

9

45. anjum1

in the uk

46. erdog82

Okay

47. erdog82

What is that equivalent to in the us?

48. anjum1

|dw:1362327623653:dw| +5x +6

49. erdog82

Huh?

50. anjum1

i dont know

51. anjum1

|dw:1362327701244:dw|

52. anjum1

factorrise

53. erdog82

54. anjum1

x squared +5x+6

55. erdog82

What do you need to do with it?

56. anjum1

factorise

57. erdog82

okay.

58. erdog82

59. erdog82

60. anjum1

yes

61. erdog82

Did it help?