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Nirmql
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Asked: 2020-02-07T03:43:49+00:00 In:

Power and exponent

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Power and exponent

Ques.14. if 10 raised to power 2y = 25 then 10 raised to power -y =?

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    2 Answers

    1. 10^2y =10×10×y=100y
      100y=25
      Y=25÷100=1\4
      10^-y=-10y^1×1\4
      Y=-10×1\4=-0.25

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    2. (10)^2y = 25

      So,

      [(10)^y]^2 = 25

      and

      (10)^y = square root (25) = 5

      Therefore,

      [10]^(-y) = 1/5

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