Question

rezolvarile complete va rog !!

Answer 1

$C^2_{3} +3!= \frac{3!}{2!(3-2)!}+1*2*3= \frac{1*2*3}{1*2}+6=3+6=9$
$2.) log_{5}(3x+4)=2 \\ DVA:x\ \textgreater \ - \frac{4}{3} \\ 3x+4=25 \\ 3x=21 \\ x=7$
S={7}