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Math destroyer test twelve question twenty eight

Discussion in 'DAT Discussions' started by 510586, Aug 8, 2015.

  1. 510586

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    Can someone show their work for this? The answer is E but I am not sure how to get there 1439087802052-207775603.jpg
     
  2. orgoman22

    orgoman22 DAT DESTROYER
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    sdn 1.JPG
     
  3. 510586

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    Oh shoot I'm a fool I thought it was (1+a)/(1-a) for some reason. Thanks!
     
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  4. 510586

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    Is this answer a typo for 38 test 12? Why isn't the x+2 in parenthesis? Like 1-(x+2) 143909109817751033461.jpg
     
  5. byahnoob

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    PHAT FINGER HA!
     
  6. 510586

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    :(
     
  7. byahnoob

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    :laugh::laugh::pirate::pirate:
     
  8. neoking77

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    It should technically be

    f(1-x) = (1-x) + 2
    which simplifies to
    f(1-x) = 1-x+2
    f(1-x) = 3-x

    So the bootcamp answer just took a shortcut and didn't bother putting in the paranthesis. The end result is the same.
     
    #8 neoking77, Aug 9, 2015
    Last edited: Aug 9, 2015
  9. 510586

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    Why is it not 1-(x+2)? If fx=x+2 shouldn't f(-x)=-(x+2)?
     
  10. neoking77

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    We're given f(x-1) = x+1
    then f(x) = x+2
    Remember f(x) means you're replacing whatever's in f(x) into the x value. Try putting the first one back into the equation
    f(x-1) = (x-1) +2 = x-1 +2 = x+1

    f(-x) = (-x) +2 = -x+2

    f(1-x)= (1-x) + 2 = 1-x+2 = 3-x
     
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  11. orgoman22

    orgoman22 DAT DESTROYER
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    (x-1)=x+1. f(x-1+1)=x+2. Then f(x)=x+2.
    To find f(1-x) we will first find f(-x) then add 1. f(-x)= -x+2 then f(-x+1)=f(1-x) = -x+2+1 = 3-x
     
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  12. 510586

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    Oh yea negative sign only affects the x right? Think that's what I was confused on
     
  13. 510586

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    Thank-you
     

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