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anonymous

  • 5 years ago

(t-5)^2=81 do I take 5 from both sides or add it?

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  1. anonymous
    • 5 years ago
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    Neither

  2. myininaya
    • 5 years ago
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    to get rid of the square, you must square root both sides

  3. anonymous
    • 5 years ago
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    no what you do first is you hvae to square root both sides . only then you can add 5 to both sides. so t - 5 = - or + sqrt(81) so t - 5 = + or negative 9 so t - 5 = 9 and therefore t = 14 and t - 5 = -9 and therefore t = -4 so t = 14 and -4 are both valid answers

  4. anonymous
    • 5 years ago
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    I see how you got it now I guess with similar problems I thought I did the same thing to this one too. How would I do one with 1/2(x-1)^5=16

  5. anonymous
    • 5 years ago
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    1/2(x-1)=16^(1/5)

  6. myininaya
    • 5 years ago
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    first multiply by the reciprocal of 1/2 on both sides so you have grouping symbol by itself on one of the equation then you will have (x-1)^5=2*16

  7. myininaya
    • 5 years ago
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    (x-1)^5=32

  8. myininaya
    • 5 years ago
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    now since this is raised to the 5th power with take the 5th power of both sides giving us x-5=32^(1/5)

  9. myininaya
    • 5 years ago
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    x-5=2

  10. myininaya
    • 5 years ago
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    so x=2+5

  11. myininaya
    • 5 years ago
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    x=7

  12. anonymous
    • 5 years ago
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    how did you get 2

  13. myininaya
    • 5 years ago
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    what is 32^(1/5)

  14. myininaya
    • 5 years ago
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    since 32^(1/5)=[2*2*2*2*2]^(1/5)=2

  15. anonymous
    • 5 years ago
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    got it when I put in calculator

  16. anonymous
    • 5 years ago
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    is this right 3z^2 =48 z=16

  17. myininaya
    • 5 years ago
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    z^2=48/3=16 so z=plus or minus 4

  18. myininaya
    • 5 years ago
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    hey but what happens when you check x=7 in the question we did before this one

  19. myininaya
    • 5 years ago
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    did you catch my mistake above?

  20. myininaya
    • 5 years ago
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    it was suppose to be x-1=(32)^(1/5)

  21. anonymous
    • 5 years ago
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    No I didn't but I was checking it

  22. myininaya
    • 5 years ago
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    x-1=2

  23. myininaya
    • 5 years ago
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    x=1+2=3

  24. anonymous
    • 5 years ago
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    It is x-1+2=3 LOL

  25. anonymous
    • 5 years ago
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    so it isn't 7

  26. anonymous
    • 5 years ago
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    it is 3

  27. myininaya
    • 5 years ago
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    so you got it good! i have to go eat. yes it is 3

  28. anonymous
    • 5 years ago
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    thank you boy I could use your help all the time have a good supper

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