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anonymous

  • one year ago

Solve -2(2x + 5) - 3 = -3(x - 1). 16 -16 -10 -13

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  1. anonymous
    • one year ago
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    @billj5 , @Michele_Laino

  2. anonymous
    • one year ago
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    So you are solving for x. Meaning you need to isolate the x-variable. What is your understanding of this Q so far?

  3. anonymous
    • one year ago
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    ok start by distributing again

  4. anonymous
    • one year ago
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    ^ Must use the distributive property first. (To get rid of those complex parenthesis!)

  5. anonymous
    • one year ago
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    You need to use the distributive property on both sides of the equation first. -2(2x+5) and -3(x-1)

  6. Michele_Laino
    • one year ago
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    yes! If we apply the distributive property of multiplication over addition at both sides, we get: -4x -10 -3 = -3x +3

  7. anonymous
    • one year ago
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    I'm not sure I can correctly distribute this question

  8. anonymous
    • one year ago
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    so now what do we do?

  9. anonymous
    • one year ago
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    |dw:1433694707661:dw|

  10. anonymous
    • one year ago
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    Combine like terms.

  11. Michele_Laino
    • one year ago
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    what is: -10-3=...?

  12. anonymous
    • one year ago
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    -7

  13. anonymous
    • one year ago
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    |dw:1433694837006:dw|

  14. Michele_Laino
    • one year ago
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    no, it is: -10 -3 = -13

  15. anonymous
    • one year ago
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    When you're in debt by $10, and get another loan for $3, you're in a total of 13$ of debt.

  16. anonymous
    • one year ago
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    Oh okay.

  17. anonymous
    • one year ago
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    Now isolate the x from either side… you'll still get the same answer regardless of which side you isolate the x with. (I'd go with the easier side)

  18. anonymous
    • one year ago
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    IF you do it correctly^^

  19. anonymous
    • one year ago
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    How would I do that?

  20. anonymous
    • one year ago
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    divide right?

  21. anonymous
    • one year ago
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    You should then get -4x-10=-3x+3 Then get variables and constants on different sides of equation -4x+3x=3+10 -1x = 13 Divide both sides by -1 Your answer should be x = -13 or D

  22. anonymous
    • one year ago
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    |dw:1433694942353:dw|

  23. anonymous
    • one year ago
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    Now what do you do?

  24. anonymous
    • one year ago
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    divide ?

  25. Michele_Laino
    • one year ago
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    try to subtract 7x from both sides, please

  26. anonymous
    • one year ago
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    No, subtract three from both sides then you can divide. (Remember we CANNOT divide/multiply if there are other constants)

  27. anonymous
    • one year ago
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    Oh, would you like me to do it the other way? @Michele_Laino

  28. Michele_Laino
    • one year ago
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    sorry you are right! @Aureyliant

  29. anonymous
    • one year ago
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    |dw:1433695063352:dw|

  30. anonymous
    • one year ago
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    Now what do you get? @FEARLESS_JOCEY

  31. anonymous
    • one year ago
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    Absolutely!

  32. anonymous
    • one year ago
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    Sorry I ran out of room but we're almost done… We would get: -16 = 7x

  33. anonymous
    • one year ago
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    Wait… did I do something wrong? The answer isn't in any of the answer choices.

  34. anonymous
    • one year ago
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    okay, and we divide right?

  35. anonymous
    • one year ago
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    Yes :)

  36. anonymous
    • one year ago
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    |dw:1433695181670:dw|

  37. anonymous
    • one year ago
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    I'm not to sure how to divide it when it is a negative number.

  38. anonymous
    • one year ago
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    @Aureyliant I think you messed up somewhere because there is no way that the answer is -2 @FEARLESS_JOCEY look back at my comment and look at how io explained it i got the correct answer

  39. anonymous
    • one year ago
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    Yes… you did. The answer is x = -16. I checked my work and I didn't see anything incorrect.

  40. anonymous
    • one year ago
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    @Michele_Laino Do you see where I may have gone wrong?

  41. anonymous
    • one year ago
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    if you divide -16 by 7 you get -2.28 You went wrong by adding positive 4x to -3x and getting positive 7x when it should have been positive 1x

  42. anonymous
    • one year ago
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    @Aureyliant

  43. Michele_Laino
    • one year ago
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    I'm pondering...@Aureyliant

  44. anonymous
    • one year ago
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    You're supposed to take the inverse of -4x = +4x. When you take it to the other side of the equation, it must become the opposite sign.

  45. anonymous
    • one year ago
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    Oh! I see where i went wrong. It was supposed to be -3x + 4x = 1x.

  46. anonymous
    • one year ago
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    I understand that but -3x did not change signs and it should have become 1x instead of positive 7x You also subtracted -3 from -10 and got 013 and then you subtracted -3 again

  47. anonymous
    • one year ago
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    I forgot the negative three. I apologize.

  48. Michele_Laino
    • one year ago
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    I got thise expression: -4x-13=-3x+3 then adding 4x to both sides, we get: -13=x+3

  49. Michele_Laino
    • one year ago
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    this*

  50. anonymous
    • one year ago
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    |dw:1433695538968:dw|

  51. anonymous
    • one year ago
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    See you guys are forgetting to cross out the three after you have moved it to the opposite side of the equation and you are ending up with an extra 3

  52. anonymous
    • one year ago
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    I sincerely apologize… I've never made this kind of silly mistake before

  53. anonymous
    • one year ago
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    Great job catching my mistake though Vet! :)

  54. Michele_Laino
    • one year ago
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    no worries :) @Aureyliant

  55. anonymous
    • one year ago
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    |dw:1433695655850:dw|

  56. anonymous
    • one year ago
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    |dw:1433695677593:dw|

  57. anonymous
    • one year ago
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    No problem! I make those kinds of mistakes every once in a while as well. I always re check my work! @FEARLESS_JOCEY do you understand what the correct answer is

  58. anonymous
    • one year ago
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    @Aureyliant you have already moved the -3 over to get -13 you do not need to subtract it again to get -16

  59. anonymous
    • one year ago
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    I understand it.

  60. anonymous
    • one year ago
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    No… I didn't. The answer is B.

  61. anonymous
    • one year ago
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    I'm not sure if it is B or D now. Lol, I'm so confused

  62. anonymous
    • one year ago
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    It's 100% B. I didn't already subtract 3 to get -13… that was an earlier step with another -3. http://prntscr.com/7e7rjb

  63. anonymous
    • one year ago
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    I think they set it up that way to make it confusing for the student.

  64. anonymous
    • one year ago
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    @Aureyliant look back at your quation you subracted 3 to get -13, but then you subtracted the 3 again to get -16 but you are not suppossed to because you gave already used it

  65. anonymous
    • one year ago
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    No, that was when I was combining like terms after distribution.

  66. anonymous
    • one year ago
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    -3 was already there since the beginning.

  67. anonymous
    • one year ago
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    There are 2 "-3"s

  68. anonymous
    • one year ago
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    |dw:1433695928056:dw|

  69. anonymous
    • one year ago
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    |dw:1433695967551:dw|

  70. anonymous
    • one year ago
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    Look… Let me do the problem again.

  71. anonymous
    • one year ago
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    OMG you are so right I am so sorry i feel like a moron! @FEARLESS_JOCEY the answer is B

  72. anonymous
    • one year ago
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    @Aureyliant

  73. anonymous
    • one year ago
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    You don't need to work it out again I understand where i messed up

  74. anonymous
    • one year ago
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    |dw:1433696003482:dw|

  75. anonymous
    • one year ago
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    Too late haha :)

  76. anonymous
    • one year ago
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    Such a long thread. Well that's all for now… TEAMWORK! Hope this helped, Jocey! :)

  77. anonymous
    • one year ago
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    Tag me if you need any more help.

  78. anonymous
    • one year ago
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    okay I will. THANKS GUYS!

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