Tyanniaswagg55
Tyanniaswagg55
25-04-2017
Mathematics
contestada
log4 x + log4(x-12)= 3
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Аноним
Аноним
25-04-2017
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
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