[tex]-x^2-5x+14<0|\cdot(-1)\\\\x^2+5x-14>0\\\\\Delta=5^2-4\cdot1\cdot(-14)=25+56=81\\\\\sqrt{81}=9[/tex]
[tex]x_1=\frac{-5-9}{2\cdot1} =\frac{-14}{2}=-7 \\x_2=\frac{-5+9}{2\cdot1} =\frac{4}{2}=2[/tex]
a=1 --> a>0 --> ramiona skierowane ku górze
x ∈ (-∞; -7) ∪ (2; ∞)
