3 pangkat 2x – 5 × 3 pangkat x – 36 = 0
3^2x – 5.3^x – 36 = 0
misal : 3^x = a
a² – 5a – 36 = 0
(a – 9)(a + 4) = 0
a – 9 = 0
a = 9
3^x = 3²
x = 2
a + 4 = 0
a = -4
3^x = -4^0
x = 0
3 pangkat 2x – 5 × 3 pangkat x – 36 = 0
3^2x – 5.3^x – 36 = 0
misal : 3^x = a
a² – 5a – 36 = 0
(a – 9)(a + 4) = 0
a – 9 = 0
a = 9
3^x = 3²
x = 2
a + 4 = 0
a = -4
3^x = -4^0
x = 0