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Verified answer
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EksPonenSiaL3^{2x+1} - 3^{x+3} - 3^x + 9 = 0
Misal :
3^x = a
3a² - 27a - a + 9 = 0
3a² - 28a + 9 = 0
(3a - 1)(a - 9) = 0
a = 1/3
3^x =3^-1 ---> x = -1
atau
a = 9
3^x = 3^2 ---> x = 2
Nilai x yg memenuhi soal :
x = -1 dan x = 2