carilah nilai x . n logx n log(x-4)=n log21 dibntu syg ngk paham bsk dikumpul

LogAritMa

n'log x + n'log (x - 4) = n'log 21
n'log x(x - 4) = n'log 21
x(x - 4) = 21
x² - 4x - 21 = 0
(x - 7)(x + 3) = 0
x = 7