Answer :
Given 
It can also be written as
⇒ 
⇒ 
We know that (am)n = amn.
⇒ 
⇒ 3 – 8(7) + 15(2) + 15
⇒ 3 – 56 + 30 + 15 = -8
∴ 
= -8
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