решите уравнения lg (x-1)+lg (x+1)=0

lg (x-1)+lg (x+1)=0x+1>0x-1>0log(x-1)+log(x+1)=0x>-1x>1log(x-1)+log(x+1)=0x>1log(x-1)+log(x+1)=0x>1(x-1)(x+1)=1x>1x=-√2отв:x=√2