Система
[tex] \left \{ {{ x^{2} + 3 x \leq 4} \atop { x^{2} +3 x\ \textgreater \ 0} \right. [/tex]
[tex] \left \{ {{ x^{2} + 3 x \leq 4} \atop { x^{2} +3 x\ \textgreater \ 0} \right. [/tex]
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Verified answer
1)x²+3x-4≤0x1+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]