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Mapel : MatematikaKelas : X SMA
Bab : Eksponen
Pembahasan :
2.3^(2x + 1) + 3^x = 5
2.3^(2x) .3 + 3^x = 5
6.3^(2x) + 3^x = 5
Misal 3^x = a
6a² + a = 5
6a² + a - 5 = 0
(6a - 5)(a + 1) = 0
a = 5/6
a = -1 —» Tidak memenuhi
3^x = 5/6
x = ³log 5/6
x = ³log 5 - ³log 6
x = 1,4 - 1,6
x = -0,2
x = -1/2