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Sup_open~study

  • 3 years ago

i need some one to show me step by step how to do this /4c-2/, c= -3 it's Absolute value

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  1. teic85
    • 3 years ago
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    plug in -3 for c, what do you get?

  2. Sup_open~study
    • 3 years ago
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    let me see :)

  3. Sup_open~study
    • 3 years ago
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    -14 ?

  4. Sup_open~study
    • 3 years ago
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    is that right ?

  5. teic85
    • 3 years ago
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    right, the value of the expression inside the absolute value is -14. But, what does absolute value mean?

  6. completeidiot
    • 3 years ago
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    examples of absolute value |x|=x |-z|=z |100|=100 |-345|=345 etc etc etc

  7. Sup_open~study
    • 3 years ago
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    i'm sorry an you explain more

  8. teic85
    • 3 years ago
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    Do you know the definition of absolute value?

  9. Sup_open~study
    • 3 years ago
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    i'm sorry i don't

  10. Sup_open~study
    • 3 years ago
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    :(

  11. teic85
    • 3 years ago
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    Absolute value is the numerical value of a number without considering the positive or negative sign. So, the absolute value of 10 is 10. The absolute value of -2 is 2. It is just the value of the number. It is always positive.

  12. Sup_open~study
    • 3 years ago
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    o ok so the "-3" is just a 3 and not a "-3 " so the answer would be 14

  13. teic85
    • 3 years ago
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    You are half right...

  14. teic85
    • 3 years ago
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    Let's back up...

  15. teic85
    • 3 years ago
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    "-3" is still -3. That doesn't change. The problem says that c = -3. So, c = -3

  16. teic85
    • 3 years ago
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    But, the problem says that you have to find /4c-2/ when c = -3

  17. teic85
    • 3 years ago
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    So, plug in -3 for c just like you did before, /4(-3)-2/ = /-12-2/ = /-14/ So, when you plug in -3 for c, the expression equals /-14/. But, the absolute value of -14 is 14.

  18. Sup_open~study
    • 3 years ago
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    o ok thanks man were did you get the ? /-12-/ + /-14? ?

  19. teic85
    • 3 years ago
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    Where did I get -12???

  20. Sup_open~study
    • 3 years ago
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    yeah :)

  21. teic85
    • 3 years ago
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    -12 is the product of 4 and -3

  22. teic85
    • 3 years ago
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    When you plug in -3 for c, you multiply 4 x -3

  23. Sup_open~study
    • 3 years ago
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    o i see now wow xD thanks man for all of your help

  24. teic85
    • 3 years ago
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    You're welcome. If you have time, try these to make sure you know how to do absolute values: Find /4c-2/ when c = 3 Find 4/c/-2 when c = -3 Find 4c - /-2/ when c = -3

  25. Sup_open~study
    • 3 years ago
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    ok awesome man thanks i will do :)

  26. Hero
    • 3 years ago
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    |4c - 2| Do you know how to use the shift button @teic85?

  27. teic85
    • 3 years ago
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    No, how does that work?

  28. Hero
    • 3 years ago
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    Hold down the shift button when pressing the \ key

  29. teic85
    • 3 years ago
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    Oh I see, I was simply using the same notation as "sup"

  30. teic85
    • 3 years ago
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    Thanks for pointing that out, though :)

  31. Hero
    • 3 years ago
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    Hold down the shift button when trying to post || absolute value symbols

  32. teic85
    • 3 years ago
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    Like this? |4c-2|

  33. Hero
    • 3 years ago
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    Precisely

  34. teic85
    • 3 years ago
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    Thanks!

  35. teic85
    • 3 years ago
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    Isn't there a keyboard shortcut for superscript too? Might come in handy for exponents

  36. Sup_open~study
    • 3 years ago
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    i am stuck on this one -/-10-z,/z =-3

  37. Sup_open~study
    • 3 years ago
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    :(

  38. Sup_open~study
    • 3 years ago
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    i got 30

  39. Sup_open~study
    • 3 years ago
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    but i think it is wrong

  40. teic85
    • 3 years ago
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    Ok, rewrite the expression after plugging in z = -3

  41. teic85
    • 3 years ago
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    Also, use |, it's the key above the enter key. You must use the shift key

  42. Sup_open~study
    • 3 years ago
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    -/10 (-3)/ like that ??

  43. teic85
    • 3 years ago
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    Nope, you are using /. Press shift and \

  44. Hero
    • 3 years ago
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    lol you're teaching people already @teic85

  45. teic85
    • 3 years ago
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    And no, the expression is missing a minus

  46. Sup_open~study
    • 3 years ago
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    i no clue what the shift thing is lol xD

  47. teic85
    • 3 years ago
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    lol yes @Hero, that's the purpose of Open Study right? :D

  48. Sup_open~study
    • 3 years ago
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    *have

  49. Sup_open~study
    • 3 years ago
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    xD

  50. Hero
    • 3 years ago
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    :D

  51. teic85
    • 3 years ago
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    haha ok, @Sup_open~study . Let's focus on the problem first.

  52. Sup_open~study
    • 3 years ago
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    i think i am so post to - it and not x it ?

  53. teic85
    • 3 years ago
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    Correct, you have to subtract z not multiply You wrote -/10 (-3)/ The original expression is -|-10-z|

  54. teic85
    • 3 years ago
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    Be careful, you also missed the negative in front of the 10

  55. Sup_open~study
    • 3 years ago
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    o i see yeah i was writing it wrong xD

  56. teic85
    • 3 years ago
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    Rewrite the expression after plugging in -3 for z

  57. Sup_open~study
    • 3 years ago
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    -/-10-3/ = 13 ?

  58. teic85
    • 3 years ago
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    z = -3, but the expression is -10 MINUS z. So, it should be -10 - (-3) which is actually -10 + 3

  59. Sup_open~study
    • 3 years ago
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    so it's 7 ??

  60. teic85
    • 3 years ago
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    What is 7? You are jumping ahead... :)

  61. Sup_open~study
    • 3 years ago
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    sorry xD

  62. teic85
    • 3 years ago
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    haha it's ok :)

  63. teic85
    • 3 years ago
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    When you plug in -3 for z, you get: -|-10 - (-3)|

  64. teic85
    • 3 years ago
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    That look about right to you?

  65. Sup_open~study
    • 3 years ago
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    yeah thanks :)

  66. teic85
    • 3 years ago
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    Ok, so we know that minus -3 is actually +3. So rewrite the entire expression with +3 in that spot

  67. Sup_open~study
    • 3 years ago
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    ok so it's -|-10 - (3)|

  68. Sup_open~study
    • 3 years ago
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    ?

  69. teic85
    • 3 years ago
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    Not quite, Minus -3 is +3. So, it is -|-10+3|

  70. teic85
    • 3 years ago
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    a negative and a negative make a positive

  71. Sup_open~study
    • 3 years ago
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    o i see but how would i solve that ??

  72. teic85
    • 3 years ago
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    ok, well now that that pesky z is gone, we can just focus on what is inside the absolute value. What is -10 + 3?

  73. Sup_open~study
    • 3 years ago
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    - 7 so it's just 7 ?

  74. teic85
    • 3 years ago
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    The absolute value of -7 is 7. Yes.

  75. Sup_open~study
    • 3 years ago
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    o ok i see now but on the answer for the study guide he put -7 why not 7 ??

  76. teic85
    • 3 years ago
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    What's in front of the absolute value?

  77. Sup_open~study
    • 3 years ago
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    i can't tell what you are looking for sorry but he had like a -1 -10 + -7 ?

  78. teic85
    • 3 years ago
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    This is the expression: -|-10+3|. What is in front of the absolute value?

  79. Sup_open~study
    • 3 years ago
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    a negative

  80. Sup_open~study
    • 3 years ago
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    ?

  81. teic85
    • 3 years ago
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    Right

  82. teic85
    • 3 years ago
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    So look at this... |-7| = 7 What is -|-7| ?

  83. Sup_open~study
    • 3 years ago
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    -7

  84. Sup_open~study
    • 3 years ago
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    ?

  85. teic85
    • 3 years ago
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    Since the negative sign is in front, it makes the expression negative. So -7 is the answer.

  86. teic85
    • 3 years ago
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    -|-7| is different than |-7|

  87. Sup_open~study
    • 3 years ago
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    o so it's just 7

  88. teic85
    • 3 years ago
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    No, it isn't just 7.

  89. teic85
    • 3 years ago
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    The expression in your problem has a negative in front like this, -|-7|

  90. Sup_open~study
    • 3 years ago
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    yes

  91. teic85
    • 3 years ago
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    So, the absolute value of -7 is 7. But, then you have to add the final negative (the one in front). So, it's -7

  92. Sup_open~study
    • 3 years ago
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    ok so when you have the - in front of the problem the answer is most likely going to be a - ???

  93. teic85
    • 3 years ago
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    Don't think "most likely". You'll get the wrong answer. That's just guessing.

  94. teic85
    • 3 years ago
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    Think about this... what is -2(1 + 3) ?

  95. Sup_open~study
    • 3 years ago
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    -8

  96. teic85
    • 3 years ago
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    Right. The negative in front changes it to negative. So, when you have a positive number times a negative number you get a negative.

  97. Sup_open~study
    • 3 years ago
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    o i see so when you change the answer to positive the negative will times it and that will make it an negative ?

  98. teic85
    • 3 years ago
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    Yes

  99. teic85
    • 3 years ago
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    The same is true for absolute values. The negative in front of -|-7| is like multiplying -1 times |-7| (what your teacher had in your notes)

  100. Sup_open~study
    • 3 years ago
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    o i see thanks man you have been a huge help i may have failed my test tomorrow if it was not for you

  101. teic85
    • 3 years ago
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    I'm glad to help. Just be careful not to forget negatives. They matter a lot.

  102. Sup_open~study
    • 3 years ago
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    yeah i know i got to keep on practicing those xD

  103. teic85
    • 3 years ago
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    Exactly. If you practice, you'll get more comfortable. Eventually, you'll be able to do it in your head :)

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