## chubbytots 2 years ago 6x^2+5-4=

1. Directrix

What are the instructions for the posted problem?

2. chubbytots

its factoring diamond

3. Directrix

There's an x missing here, I think --> 6x^2+5-4= --> after the "5." I don't know the diamond technique. I can factor by grouping.

4. chubbytots

yeah factor by grouping :)

5. Directrix

6x^2 +5x -4 What are two numbers that multiply to -24 AND add to 5 ?

6. chubbytots

2?

7. chubbytots

i think e. e

8. chubbytots

ithink anyways i have the other side of it.. its (2x-1)( )

9. Directrix

Okay. What number times -1 will multiply to -4. -1*? = - 4 ? Help me out a little bit, and I can help you finish this. Okay?

10. chubbytots

1

11. Directrix

-1 * 1 = -1 so that is not it.

12. chubbytots

1 can multiply -4

13. chubbytots

no wait wat?? i need to find a number that can multiply by 4?

14. Directrix

Yes, so -1 times 4 = -4 which means 6x^2 +5x -4 = (2x-1)( ? +4 ) We're almost there. (2x) times what equals 6 x^2 ?

15. chubbytots

3x?

16. chubbytots

so its 3x-4?

17. Directrix

Let's see if it works: 6x^2 +5x -4 = (2x-1)( 3x +4 ) ?? @chubbytots What do you think?

18. chubbytots

yep its right actually im answering a puzzle e. e

19. Lynncake

that's right @Directrix

20. chubbytots

\[3x^2-11x-20=\]

21. Directrix

>>so its 3x-4? I did not get that.

22. chubbytots

its 3x+4

23. chubbytots

for da first group and the second group is?

24. Directrix

(2x-1)*(3x-4) multiplies to 6x^2 -11x + 4 which is not the given problem.

25. Directrix

Okay, let's try that.

26. chubbytots

6x^2 -11x + 4=(2x-1)(3x+4)

27. Directrix

(2x-1)*(3x+4) = 6x^2 -3x + 8x -4 = 6x^2 + 5x - 4.

28. chubbytots

thats da second question and da second question is \[3x^2-11x-20=(3x+4)( ? )\]

29. chubbytots

i mean third**

30. Directrix

I only saw the first problem.

31. chubbytots

i need the third problem cuz this is a pzzle v. v

32. Directrix

3x^2 -11x - 20 = (3x+4) * ( ) What times 3x is equal to 3 x^2 ?

33. chubbytots

4x+3?

34. Directrix

3x^2 -11x - 20 = (3x+4) * (x )

35. Directrix

3x times 4x = 12 x^2 -->doesn't work

36. chubbytots

is it positve 3?

37. Directrix

3x times 3 = 9x.

38. chubbytots

yes

39. Directrix

Oh, you mean ( x + 3) as the second factor?

40. chubbytots

yes

41. Directrix

(3x+4) * (x + 3 ) = 3x^2 -11x - 20 ?? 3x^2 + 9x + 4x + 12 Nope.

42. Directrix

We could guess forever.

43. chubbytots

xDD i think lol and another one :O

44. Directrix

Here is where we are: 3x^2 -11x - 20 = (3x+4) * (x ) We have to get -20 for the last term. 4 times what equals - 20 ?--->

45. chubbytots

i think its x-3?

46. Directrix

4 times - 3 is not -20.

47. chubbytots

i mean 2?

48. chubbytots

i mean 5 sorry :o

49. Directrix

4 times 5 is close but 4 times 5 does not equal -20

50. chubbytots

hmmmm

51. chubbytots

i think we need to make one of them a negative right?

52. Directrix

Yes.

53. chubbytots

so-5?

54. Directrix

Yes

55. chubbytots

its x-5?

56. Directrix

3x^2 -11x - 20 = (3x+4) * (x - 5 )

57. Directrix

That works.

58. chubbytots

yes

59. chubbytots

\[6x^2+11x-10=(2x+5)(?)\]

60. Directrix

It's your turn to do this one. :) You come up with the factors, and I will check.

61. chubbytots

i'll be guessing dou

62. Directrix

That's what I ended up doing because you didn't like factoring by grouping.

63. chubbytots

2x+1

64. chubbytots

lol actually this s factoring by grouping.. and i need to do factor diamond

65. chubbytots

its like two steps first is factoring by grouping and factoring diamond

66. Directrix

That diamond thing is sophisticated guessing for me.

67. chubbytots

x. x so can we do factoring by grouping?

68. Directrix

(2x+1)*(2x+5) = 4x^2 + 12x + 5 --> This is from your guess.

69. Directrix

It didn't work.

70. chubbytots

2x-5?

71. Directrix

I'm going to group.

72. chubbytots

is it 6x10?

73. chubbytots

6x10=60 ryt and wet going to make one of them a negative?

74. Directrix

6 + 10 is not 11

75. Directrix

15 and -4.

76. Directrix

x^2 + 11x - 10 = x^2 + 15x - 4x - 10

77. chubbytots

5x+2?

78. Directrix

This thread is so long that I have lost the problem.

79. Directrix

(2x + 5) * ( 3x + 2) That is my last factoring problem on this puzzle.

80. chubbytots

so its 3x+2?

81. chubbytots

3x-2?

82. Directrix

6x^2 + 15x - 4x - 10 = 3x(2x + 5) - 2(2x + 5) = (2x + 5) * ( 3x - 2). Right.

83. chubbytots

owoo that was brain storm >,<

84. Directrix

The more of this stuff you do, the better you get. Except, I seem to be getting worse.

85. chubbytots

ohh yah sure cuz when im learning this i was lazy thats why i came up here >.<

86. Directrix

What is the next factoring problem?

87. chubbytots

how abut this? \[7x^2+13x-2=(x+2)(?)\]

88. chubbytots

xDD under the typing box thou v v v v v

89. chubbytots

actually this factoring group so on this is the new lesson on our school e. e''''

90. chubbytots

91. chubbytots

xDD uhh nope o. o

92. chubbytots

ohh well i better rap dis up cuz im gonna go early tommorow well thanks fo the help :)

93. Directrix

Okay. See later on here.

94. chubbytots

ok byee