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(x - 3)² = x² - 2x - 15
x² - 6x + 9 = x² - 2x - 15
x² - x² - 6x + 2x = - 15 - 9
- 4x = - 24
x = - 24/ -4
x = 6
9) - 4. + 3 > 0
( - 1) ( - 3) > 0
batas - batas penyelesaian = 1 ⇒ x = 2
= 3 ⇒ x = 2³ = 8
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2 8
x < 2 atau x > 8
11) log log (x + 3) + log 2 = log log 16x
log log (x + 3) - log log 16x = - log 2
log [log (x + 3) / log 16x)] = log
log (x + 3) / log 16x = 1/2
log (x + 3) = 1/2 . log 16x
log (x + 3) = log
x + 3 = ...pangkatkan 2
(x + 3)² = 16x
x² + 6x + 9 = 16x
x² + 6x - 16x + 9 = 0
x² - 10x + 9 = 0 ⇒ a = 1 ; b = - 10 ; c = 9
x1 . x2 = c/a
= 9/1
= 9
15) = 1000
log = log 1000
(2 + log x) log x = 3
log² x + 2.log x = 3
log² x + 2.log x - 3 = 0 ⇒ a = 1 b = 2 ; c = - 3
= c/a = - 3/1 = - 3