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jenni_fowler

  • 4 years ago

evaluate 2x^-1y^3 if x=2 and y=-1

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  1. Tomas.A
    • 4 years ago
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    insert 2 instead of x and insert -1 instead of y

  2. jenni_fowler
    • 4 years ago
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    \[2(2)^{-1}-1^{3}\]

  3. jenni_fowler
    • 4 years ago
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    like that now what do i do

  4. anilorap
    • 4 years ago
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    \[2(2)^{-1}(-1)^{3}\]

  5. Tomas.A
    • 4 years ago
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    \[n^{-1}=\frac{1}{n}\] \[n^3=n\cdot n\cdot n\]

  6. jenni_fowler
    • 4 years ago
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    okay i understand that part i just need help with the combined part

  7. Tomas.A
    • 4 years ago
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    so just multiply and subtract answers you get

  8. jenni_fowler
    • 4 years ago
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    (\[1/4* 1^{-3}\]

  9. jenni_fowler
    • 4 years ago
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    im confused

  10. anilorap
    • 4 years ago
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    \[x^{-1}= 1/x\] so |dw:1324153439822:dw|

  11. jenni_fowler
    • 4 years ago
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    wait \[1/4(1^{3})\]

  12. anilorap
    • 4 years ago
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    plugging your numbers

  13. anilorap
    • 4 years ago
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    |dw:1324153490541:dw|

  14. anilorap
    • 4 years ago
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    |dw:1324153521385:dw|

  15. anilorap
    • 4 years ago
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    what you think?

  16. jenni_fowler
    • 4 years ago
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    -1

  17. anilorap
    • 4 years ago
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    yes

  18. jenni_fowler
    • 4 years ago
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    thanks soo much

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