Write the Word or Phrase That Best Completes Each Statement $b ^ { \square } = \frac { 1 } { b ^ { n } }$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-For a nonzero real number b, the value $b ^ { \square } = \frac { 1 } { b ^ { n } }$