Question

Daca ab+ac=25 si a =-5,calculati b+c

Answer 1

$ab+ac=25 \\\\ \ \textless \ =\ \textgreater \ a(b+c)=25 \\\\ -5(b+c)=25 \ \ \ |:5 \\\\ -(b+c)=5 \\\\ \boxed{b+c=-5}$

Answer 2

ab+bc=25
a(b+c)=25
-5(b+c)=25
b+c=25:5
b+c= -5