Question

a equação log(x+2) = 2 log x

Answer 1

2 Log x = log (x+2)
log x² = log (x+2)
x² = x+2
x² -x -2 = 0
∆= (-1)² -4.1.(-2)= 1 +8 = 9 ==> √∆=3
x = 1+3/2 = 4/2 = 2 ✓