Question

Ada yg bisa bantu gaa hehe

Answer 1

3^(2x+1) - 28.3^x + 9 = 0
3^(2x) . 3 - 28. 3^x + 9 = 0
3. (3^x)^2 - 28.3^x + 9 = 0
misal 3^x = a
3a^2 - 28a + 9 = 0
(a - 9)(3a - 1) = 0
a = 9 atau a = 1/3
3^x = 3^2 atau 3^x = 3^-1
x = 2 atau x = -1
karena x1 > x2 maka x1 = 2 dan x2 = -1
3x1 - x2 = 6 - (-1) = 7