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mmbuckaroos

  • 2 years ago

cubed root of (-8x^9).... I have -2x^?

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  1. mmbuckaroos
    • 2 years ago
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    |dw:1327286055825:dw|

  2. mark_o.
    • 2 years ago
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    (-8x^9)^1/3 =-2x^3

  3. mmbuckaroos
    • 2 years ago
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    so you just take the square root of the nine

  4. mark_o.
    • 2 years ago
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    take the cube root of -8 that is -2 and the x power of 9 divided by 1/3 power=3

  5. mmbuckaroos
    • 2 years ago
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    oh ok thank you

  6. mark_o.
    • 2 years ago
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    i mean multiplied by 1/3 or divided by 3

  7. mark_o.
    • 2 years ago
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    yw

  8. mmbuckaroos
    • 2 years ago
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    so what do you do if it says the cubed root of say 2? what is that then?

  9. mark_o.
    • 2 years ago
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    ok cube root of 2=2^(1/3) if you use a calculator =1.2599

  10. mmbuckaroos
    • 2 years ago
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    ok thanks I'm not really sure how to do this hw I have lol so Im just trying to piece it all together thank you!

  11. mark_o.
    • 2 years ago
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    |dw:1327286991080:dw|

  12. mark_o.
    • 2 years ago
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    1.2599(1,2599)(1.2599)=1.2599^3 =2

  13. mmbuckaroos
    • 2 years ago
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    |dw:1327287288675:dw|

  14. mark_o.
    • 2 years ago
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    a god example is cube root of -8 that is (-8)^1/3=-2 to check this (-2)x(-2)x(-2)=-8

  15. mark_o.
    • 2 years ago
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    (-2)(-2)(-2)= (-2)^3=-8 this is a cubed of -2,,, now its reversed is the cube root cube root of -8=(-8)^(1/3) =-2

  16. mark_o.
    • 2 years ago
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    if (-b)^1/3=-a then (-a)^3=-b

  17. mmbuckaroos
    • 2 years ago
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    right ok

  18. mark_o.
    • 2 years ago
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    algebraically,,,,if (-b)^1/3=-a here lets put both sides to the power of 3 [ (-b)^1/3 ]^3=[-a]^3 [ (-b)^3/3 ]=[-a]^3 [ (-b)^1 ]=[-a]^3

  19. mark_o.
    • 2 years ago
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    good luck now

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