Question

Rezolvati ecuatia: 3x+1=-8 in multimea B={-1,0,1,3}

Answer 1

    
$\displaystyle 3x+1 =-8 \\ 3x=-8-1 \\ 3x=-9 \\ \\ x= \frac{-9}{3} = \boxed{-3} \\ \\ -3 \notin B \\ \\ =\ \textgreater \ \;\;\boxed{\text{Ecuatia nu are solutii in }B=\{-1;~0;~1;~3\}}$