Prove the following

Question:

(-5/7)-5 is equal to:

(a) (5/7)-5 

(b) (5/7)5 

(c) (7/5)5 

(d) (-7/5)5

Solution:

(d) (-7/5)5

Explanation: (-5/7)-5=1/(-5/7)5=(-7/5)5

(By the law of exponents: a-n = 1/an)

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