Rostislav10balov = 10√8-5±78)(9+8)/6-2

Lesben Log²5 x - log5 x² = 3
log²5 x - 2log5 x = 3
log5 x = z
z²-2z-3=0
(z-3)(z+1)=0
a)z-3=0,z=3, log5 x = 3, x=5³,x=125
b)z+1=0,z=-1, lo5 x = -1 , x=1/5