log (X²-1)=3 log x+log x=3
2 2 4
Soluções para a tarefa
a)
log (X²-1)=3 -> X²-1=8 -> X² = 9 x=+-3
2
b) log x
2
log x+log x=3 -> log x + ---------- = 3
2 4 log 4
2
fazendo y= log x
2
y
y+----- =3
2
3y = 6
y=2
logo log x =2 ---> x=4
2
a)
log (X²-1)=3 -> X²-1=8 -> X² = 9 x=+-3
2
b) log x
2
log x+log x=3 -> log x + ---------- = 3
2 4 log 4
2
fazendo y= log x
2
y
y+----- =3
2
3y = 6
y=2
logo log x =2 ---> x=4
2