Răspunsuri

2014-06-18T15:16:12+03:00
F) c.d.e. x^2 -4x > 0 => x>4 si 6-3x>0 => x> 2 din acestea  2 => x aparttine (2: +oo)
lg (X^2-4x)=lg3(2-x)
x^2-4x=6-3x
x^2-4x+3x-6=0
x^2 -x-6=0
delta =25

x1,2 =-b+ - radical delta / 2a => x1=3 si x2=-2 => x=3 apartine (2:+oo)