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Sat prep help

  1. Sep 11, 2008 #1
    1/(1/a)-(1/b) a cannot = 0 b cannot equal= 0 and a cannot equal b



    i would gladly appreciate if someone can help me
     
  2. jcsd
  3. Sep 11, 2008 #2
    Ok ... so what is the problem asking?
     
  4. Sep 11, 2008 #3
    just asking to simplify the problem
     
  5. Sep 11, 2008 #4
    [tex]\frac{1}{\frac{1}{a}}-\frac{1}{b}[/tex]

    Multiply the numerator of 1/(1/a) by a and the denominator (1/a) by a.

    Also, next time post this in the Precalculus section.
     
  6. Sep 11, 2008 #5
    is that wat you think it is or the answer and how did you get there and from my answer choices thats not one them
     
  7. Sep 11, 2008 #6
    I'm not going to do it for you.

    Continue working it with what I suggested with my other reply.
     
  8. Sep 11, 2008 #7
    ok no prob
     
  9. Sep 11, 2008 #8
    ok i have this so far a-1/b im i in the right path
     
  10. Sep 11, 2008 #9
    Good!

    So what is the requirement to add fractions? What do you need in common?
     
  11. Sep 11, 2008 #10
    a denominator if im correct
     
  12. Sep 11, 2008 #11
    Yep. So a's denominator is just 1, so 1/b determines the denominator needed.

    Multiply a's numerator and denominator by what number or letter?
     
  13. Sep 11, 2008 #12
    multiply by b
     
  14. Sep 11, 2008 #13
    So what do you get?
     
  15. Sep 11, 2008 #14
    b-a please tell me im correct
     
  16. Sep 11, 2008 #15
    because if i multiply by b the b cancels in the denominator and then its a-b or b-a right
     
  17. Sep 11, 2008 #16
    No, you're only multiplying a by b and writing all of the numerator under a common denominator, b.

    Ex:

    [tex]1-\frac{1}{2}=1\cdot\frac{2}{2}-\frac{1}{2}=\frac{2-1}{2}[/tex]
     
  18. Sep 11, 2008 #17
    so it should equal ab-1/b
     
  19. Sep 11, 2008 #18
    Be careful with how you write or type it.

    Is that [tex]ab-\frac{1}{b}[/tex] or [tex]\frac{ab-1}{b}[/tex]???
     
  20. Sep 11, 2008 #19
  21. Sep 11, 2008 #20
    ab-1/b
    the second one
     
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