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March 28, 2017

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why is the answer to this question no real root?

(-81)^3/4

  • alg. 2 - ,

    Because -81^3 is a negative number. If you take a 1/4 root of any negative number (which is the same thing as taking a square root twice), you get imaginary or complex (real + imaginary) numbers.

  • alg. 2 - ,

    the third power of -81 is a negative number
    you can not take a square root of a negative number and get a real number.
    (1/4) power is square root of square root.

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