Log4(x-2)+log4(x-8)=1
Log₄(x-2)+log₄(x-8)=1 log₄(x-2)(x-8)=log₄4 log₄(x²-8x-2x+16)=log₄4 x²-10x+16=4 x²-10x+12=0 D=(-10)²-4*1*12=100-48=52 x₁=(10+2√13)/2=5+√13 x₂=(10-2√13)/2=5-√13