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Discussion :: Surds and Indices

  1.  

    (0.04)-1.5 = ?
    2. A.

    25
    B.

    125
    C.

    250
    D.

    625

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    Answer : Option B

    Explanation :

    (0.04)-1.5 =\([ \frac {4} {100 }]^-1.5\)

                    =\([\frac { 1 } { 2 5} ]^-(3/2)\)

     = (25)(3/2)

       = (52)(3/2)

       = (5)2 x (3/2)

       = 53

       = 125.

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