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anonymous

  • one year ago

I need help with math please wait while I type the equation into the comments.

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  1. anonymous
    • one year ago
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    \[(-27)^{\frac{ 2 }{ 3 }}\]

  2. anonymous
    • one year ago
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    It's multiple choice a. -9 b. 9 c. 81 (I thought it was -9 but that turned out wrong)

  3. anonymous
    • one year ago
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    @AutumnRoseT thanks but I need to actually know how to do it and I don't need to graph it

  4. deana99
    • one year ago
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    I can help

  5. anonymous
    • one year ago
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    OK thank you @deana99 please do.

  6. anonymous
    • one year ago
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    Look, I know the answer is nine but I just need to know how to figure that out.

  7. amistre64
    • one year ago
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    the top of the fraction tells us the power, the bottom tell us the root

  8. amistre64
    • one year ago
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    what is (-27)^2

  9. anonymous
    • one year ago
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    729

  10. amistre64
    • one year ago
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    good now we root it \[\sqrt[3]{729}\]

  11. anonymous
    • one year ago
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    I don't know how to do that

  12. amistre64
    • one year ago
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    2/3 power of 2, root of 3

  13. amistre64
    • one year ago
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    well, you can formulate a table of perfect cubes maybe ... and compare

  14. amistre64
    • one year ago
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    what is 10^3?

  15. anonymous
    • one year ago
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    300

  16. amistre64
    • one year ago
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    no, 10*10*10 is not 300

  17. Here_to_Help15
    • one year ago
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    hint 100*10= ?

  18. anonymous
    • one year ago
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    i mean 1000

  19. Here_to_Help15
    • one year ago
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    Ding ding :)

  20. amistre64
    • one year ago
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    1000 yes, and 729 is less than that, so we are less then 10^3 what is 5^3?

  21. anonymous
    • one year ago
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    125

  22. anonymous
    • one year ago
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    ok so it's nine

  23. anonymous
    • one year ago
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    because nine cubed is 729

  24. amistre64
    • one year ago
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    and 125 is less then 729 we know we are between 5 and 10 what is 6^3, 7^3, 8^3, and 9^3 yeah, its 9, since 9^3 = 729 :)

  25. anonymous
    • one year ago
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    OK thank you

  26. amistre64
    • one year ago
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    the idea tho is to power the top , then root the bottom

  27. amistre64
    • one year ago
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    one idea, if you feel spirited: (-27)^(2/3) = y (-27)^(2/3) * (-27)^(1/3) = y(-27)^(1/3) (-27)^(2/3+1/3) = y(-27)^(1/3) -27 = y(-3) -27/(-3) = y

  28. Here_to_Help15
    • one year ago
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    Dividing a negative and a negative you will get a positive! IMPORTANT TO KEEP IN MIND :)

  29. Here_to_Help15
    • one year ago
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    Positive and negative will be NEGATIVE AND + and + will be +

  30. anonymous
    • one year ago
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    Yeah thanks @Here_to_Help15 very helpful

  31. Here_to_Help15
    • one year ago
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    :)

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