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3 years ago

15

Log4 x + log4(x-12)= 3

1 answer:

stellarik [79]3 years ago

6 0

<span> log4(x+12)+log4x=3
log4(x(x+12))=3
log4(x^2+12x)=3
4^3=x^2+12x
64=x^2+12x
x^2+12x-64=0
(x+16)(x-4)=0
x=4 </span>

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