Evaluate $5^{-2}$.

Evaluate $5^{-2}$.
  1. $-25$
  2. $\dfrac{1}{25}$
  3. $-\dfrac{1}{25}$
  4. $\dfrac{1}{10}$

Solution

By definition, $a^{-n} = \dfrac{1}{a^{n}}$. So $5^{-2} = \dfrac{1}{5^{2}} = \dfrac{1}{25}$.

Asked in: NSO

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