Jika 8ⁿ = 27, maka 2(4ⁿ) - 2(2ⁿ) = ...

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Bab Bilangan Berpangkat
Matematika SMA Kelas X

8ⁿ = 27

2 (4ⁿ) - 2 (2ⁿ)
= 2 (8^(2/3))ⁿ - 2 (8^(1/3))ⁿ
= 2 (((8ⁿ)^(2/3)) - ((8ⁿ)^(1/3)))
= 2 .(27^(2/3) - 27^(1/3))
= 2 (3² - 3)
= 2 (9 - 3)
= 2 . 6
= 12