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Verified answer
Mapel : MatematikaKelas : X SMA
Bab : Pertidaksamaan Kuadrat
Pembahasan :
7^(2x) - 8 . 7^x + 7 > 0
Misal 7^x = a
a² - 8a + 7 > 0
(a - 7)(a - 1) > 0
a < 1 atau a > 7
a < 1
7^x < 1
x < 0
a > 7
7^x > 7
x > 1
Hp : {x| x < 0 atau x > 1}