Question

log3(5x-1)=2log3(x+1)
va rog!​

Answer 1

Răspuns:

S={1,2}

Explicație pas cu pas:

log3(5x-1)=2log3(x+1)

log3(5x-1)=log3(x+1)²

5x-1=x²+2x+1

x²-3x+2=0

(x-2)(x-1)=0⇒x∈{1,2}

S={1,2}