21. log (x² - 4x + 3) = log (3 - 2.x)
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Jawab:
x = 0 atau x = 2
Penjelasan dengan langkah-langkah:
log (x2 - 4x + 3) = log (3 - 2x)
x2 - 4x + 3 = 3 - 2x
x2 - 4x + 3 - 3 + 2x = 0
x2 - 2x = 0 -> x * (x - 2) = 0
Maka x = 0 atau x = 2
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