Question 380484
You can graph it and look for the region when it's greater than zero (above the x-axis).
{{{drawing(300,300,-8,8,-8,8,blue(line(-4,-100,-4,100)),blue(line(0,100,0,-100)),graph(300,300,-8,8,-8,8,0,x^2+4x))}}}
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Solution region:({{{-infinity}}},{{{-4}}}) U ({{{0}}},{{{infinity}}})