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Math Help - square roots. stuck!!!

  1. #1
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    square roots. stuck!!!

    square roots. stuck!!!-.bmp those are the questions which i need help on. the first on i need to find the number which goes up the top and the rest i need to know what the answers are- but could u please explain it. thanks
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  2. #2
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    Re :

    (1) \sqrt{8}=2.8282828

    (2) \sqrt[3]{64}=4

    (3) \sqrt[3]{-1}=-1
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  3. #3
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    Quote Originally Posted by mathaddict View Post
    (1) \sqrt{8}=2.8282828

    (2) \sqrt[3]{64}=4

    (3) \sqrt[3]{-1}=-1

    how do i work it out???
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  4. #4
    Newbie joserizal's Avatar
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    2.8282 * 2.8282 = 7.97.... also equals to 8
    4 * 4 * 4 = 64
    -1 * -1 * -1 = -1
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  5. #5
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    i understand now thanks alot mate
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  6. #6
    Newbie joserizal's Avatar
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    no problem you just multiply the answer with the itself depending on the root.
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  7. #7
    A riddle wrapped in an enigma
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    Quote Originally Posted by mathaddict View Post
    (1) \sqrt{8}=2.8282828
    Not quite.

    \sqrt{8} \approx 2.828427125 or in simplest radical form as \sqrt{4 \cdot 2}=2\sqrt{2}
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