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- 7 = 0
= 7
= 2 .log x
log 7 = log x²
x² = 7
x = √7
=
5x³ - 4x = ....bagi dengan x
5x² - 4 =
0 = - 5x² + 4
0 = (x² - 1) (x² - 4)
x² - 1 = 0 atau x² - 4 = 0
x² = 1 atau x² = 4
x = 1 atau x = - 1 atau x = 2 atau x = -2
- 2 < log (x - 1) < 2
log (x - 1) > - 2 dan log (x - 1) < 2
log (x - 1) > log dan log (x - 1) < log 10²
x - 1 > dan x - 1 < 10²
x - 1 > 0,01 dan x - 1 < 100
x > 1 + 0,01 x < 100 + 1
x > 1,001 x < 101
1,001 < x < 101