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1) log (N)² =2*log(N)
2) Si log a = lob b , entonces a = b
log(16 - x²) / log(3x-4) =2
log(16-x²) =2* log(3x-4)
Usamos la propiedad 1) :
log(16-x²)=log(3x-4)²
Usamos la propiedad 2):
Si log(16-x²)=log(3x-4)² , entonces 16-x² = (3x-4)²
16-x²=(3x-4)²
16-x² = (3x)²-2*3x*4+4²
16-x² = 9x²-24x+ 16
16-16=9x²-24x+x²
10x²-24x=0
Factorizamos x:
x(10x-24)=0
x=0 y 10x-24=0
10x-24=0
x=24/10
x=12/5
x={0,12/5}