Answer :

Given

It can also be written as

⇒

⇒

__We know that (a ^{m})^{n} = a^{mn}.__

⇒

⇒ 3 – 8(7) + 15(2) + 15

⇒ 3 – 56 + 30 + 15 = -8

∴ = -8

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