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anonymous

  • one year ago

x f(x) -1 1 2 3 3 6 5 7 7 8 The values in the table define the function f(x). The value of f^-1(3) is_____________ , and the value of f^-1(8) is____________.

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  1. welshfella
    • one year ago
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    do you know what f^-1(x) means

  2. anonymous
    • one year ago
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    no

  3. anonymous
    • one year ago
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    something about inverse functions

  4. Astrophysics
    • one year ago
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    For the values given the inverse values are just switched from the original function

  5. welshfella
    • one year ago
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    Ok - it means the Inverse of f(x) yes

  6. anonymous
    • one year ago
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    so its f(x)?

  7. Astrophysics
    • one year ago
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    so if you have x = -1 f(x) = 1, you'll have x = 1 f^(-1)(x) = -1

  8. Astrophysics
    • one year ago
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    notice how it's just switched around

  9. welshfella
    • one year ago
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    |dw:1437652593147:dw|

  10. Astrophysics
    • one year ago
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    |dw:1437652641126:dw|

  11. anonymous
    • one year ago
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    so replace x for y?

  12. Astrophysics
    • one year ago
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    Yeah you're basically replacing x and y (x,y) ->(y,x)

  13. welshfella
    • one year ago
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    In my diagram f(x) maps the value 1 to 3 f^-1 (x) maps 3 to 1

  14. anonymous
    • one year ago
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    i still dont know the answer

  15. Astrophysics
    • one year ago
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    |dw:1437652879340:dw|

  16. Astrophysics
    • one year ago
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    I think it should be pretty clear now

  17. anonymous
    • one year ago
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    so the value of f^-1(3) is 1?

  18. Astrophysics
    • one year ago
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    No...

  19. Astrophysics
    • one year ago
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    \[f^{-1}(1) = -1~~~f^{-1}(3) = ?\]

  20. anonymous
    • one year ago
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    -3?

  21. Astrophysics
    • one year ago
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    The input is the x, the output if the f^(-1)(x)

  22. Astrophysics
    • one year ago
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    No just look at the table :\

  23. anonymous
    • one year ago
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    2?

  24. Astrophysics
    • one year ago
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    Yeah

  25. Astrophysics
    • one year ago
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    That's all to it, like I was explaining earlier, you're just flipping the (x,y) basically.

  26. Astrophysics
    • one year ago
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    So what is f^(-1)(8) fill out the table and see

  27. anonymous
    • one year ago
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    and f^-1(8) is 7?

  28. Astrophysics
    • one year ago
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    Yes, exactly! :)

  29. anonymous
    • one year ago
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    thanks

  30. Astrophysics
    • one year ago
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    Np

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