tolong kakak... ~.........

misal 2log x = a, maka
2a^2 + 5a +2 = 0
(2a + 1) (a+2) = 0
2a +1 = 0 atau a + 2 = 0
a = -1/2 atau a = -2
2log x = -1/2. ==» x = (2)^-1/2 = 1/(2)^1/2 = 1 / akar 2 = (akar 2) / 2
2log x = -2. ==» x = 2^-2 = 1/2^2 = 1/4