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donnie1999

  • one year ago

If f(x) = x^2 + 9x and g(x) =1/x, find f(g(-1)).

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  1. donnie1999
    • one year ago
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    @dcskaf

  2. donnie1999
    • one year ago
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    i got 1/9

  3. anonymous
    • one year ago
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    ok just a sec

  4. anonymous
    • one year ago
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    what did you get for g(-1)

  5. donnie1999
    • one year ago
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    i re did it and got 10

  6. anonymous
    • one year ago
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    ok but what did you get for g(-1)

  7. donnie1999
    • one year ago
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    5

  8. anonymous
    • one year ago
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    Can you show me the steps you took?

  9. donnie1999
    • one year ago
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    idk i was wondering if u could show me i'm kind of clueless

  10. anonymous
    • one year ago
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    ok so to solve this kind of equations you have to look at the third instruction which here is f(g(-1)) this equation that x in g(x) is equal to -1 and that the outcome of g(-1) is the x in f(x)

  11. anonymous
    • one year ago
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    |dw:1436450939193:dw|

  12. anonymous
    • one year ago
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    so you plug it in to g(x) do you get it so far?

  13. donnie1999
    • one year ago
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    yah i guess so ???

  14. anonymous
    • one year ago
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    all you have to know is you start with the inside equation first so g(-1)=1/(-1) = -1

  15. anonymous
    • one year ago
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    Ok?

  16. donnie1999
    • one year ago
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    k

  17. anonymous
    • one year ago
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    so since it is f(g(-1)) this means we can put -1 instead of g(-1)

  18. anonymous
    • one year ago
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    because we solved for it before

  19. donnie1999
    • one year ago
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    k so the answer 10 srry this is timed and i only go 2 more mins

  20. anonymous
    • one year ago
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    no 8

  21. donnie1999
    • one year ago
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    do u mean -8

  22. anonymous
    • one year ago
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    oh yes

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spraguer (Moderator)
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