Question

Решить уравнение l + хι = ι3х + 3ι

Answer 1

$|x^2+x|=|3x+3|; |x|\cdot |x+1|=3|x+1|; |x+1|(|x|-3)=0;\left [ {{|x+1|=0} \atop {|x|-3=0}} \right.;$

$\left [ {{x+1=0} \atop {|x|=3}} \right. ; \left [ {{x=-1} \atop {x=\pm 3}} \right. .$

ответ: $-1;\pm 3$