bantu tentang logaritma.............

Logaritma

4 (4 - log x )log x = 15
misal log x = a
4(4 - a)a = 15
(16-4a)a = 15
16a - 4a² = 15
4a² - 16a + 15 = 0
(2a - 5)(2a - 3) = 0
a = 5/2 atau a = 3/2

log x = 5/2
x = 10^(5/2)

log x = 3/2
x = 10^(3/2)

10^(5/2) . 10^(3/2)
= 10^(8/2)
= 10⁴
= 10000