briqueen
briqueen
15-04-2016
Mathematics
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Equivalent to log3(x+4)
Respuesta :
Аноним
Аноним
15-04-2016
log3(x-2)+log3(x+4)=3
log3[(x-2)(x+4)]=3
(x-2)(x+4)=3^3
x^2+4x-2x-8 = 9
x^2+2x-8 = 9
x^2+2x-17 = 0
.
Since we can't factor, we must use the quadratic equation.
Do so will yield:
x = {3.243, -5.243} This is all I know of...
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