Question

Si 5x + x² > 100, entonces x

Answer 1

x²+5x-100>0  ⇔(x+5/2)²>100+25/4⇔x+5/2>√425/4 
x+5/2=5√17/2  x=(5√17-5)/2 y( -5√17-5)/2
 x=<-∞,(-5√17-5)/2>∪<(5√17-5)/2,∞>