Logarithm question equation

I'm stuck on an equation :

$({\mathrm{log}}_{8}x{)}^{2}+2{\mathrm{log}}_{8}x+1=0$

I've played with it without any success. Any indications would be greatly appreciated...

Thank you!

I'm stuck on an equation :

$({\mathrm{log}}_{8}x{)}^{2}+2{\mathrm{log}}_{8}x+1=0$

I've played with it without any success. Any indications would be greatly appreciated...

Thank you!