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2(^4log x)² - 6(^4log x - ^4log 2) + 1 = 0
2(^4log x)² - 6(^4log x - 1/2) + 1 = 0
2(^4log x)² - 6.^4log x + 3 + 1 = 0
2(^4log x)² - 6.^4log x + 4 = 0
misal ^4log x = a
2a² - 6a + 4 = 0
a² - 3a + 2 = 0
(a - 1)(a - 2) = 0
a = 1 a = 2
^4log x = 1 ^4logx = 2
x = 4 x = 16
x1 + x2 = 20
36) (2.log x - 1).1/(^xlog 10) = log 10 *1/^a log b = ^blog a*
(2.log x - 1).log x = 1
2.log²x - log x - 1 = 0
misal log x = a
2a² - a - 1 = 0
(2a + 1)(a - 1) = 0
a = -1/2 a = 1
log x = -1/2 log x = 1
x = 10^-1/2 x = 10
= 1/√10
x1.x2 = 1/√10 . 10
= 10/√10 x √10/√10) *rasionalkan*
= √10