Question

Система
$left { {{ x^{2} + 3 x leq 4} atop { x^{2} +3 x textgreater 0} right.$

Answer 1

1)x²+3x-4≤0
x1+x2=-3 U x1*x2=-4⇒x1=-4 U x2=1
-4≤x≤1
2)x²+3x>0
x(x+3)>0
x=0  x=-3
x<-3 U x>0
x∈[-4;-3) U (0;1]