[tex]x^2+4x-21\leq0\\\\\Delta=100\rightarrow \sqrt{\Delta}=10\\\\x_1=\frac{-4-10}{2}\ \vee \ x_2=\frac{-4+10}{2}\\\\x_1=-7\ \vee \ x_2=3\\\\[/tex]
Odp.
x ∈ <-7;3>
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[tex]x^2+4x-21\leq0\\\\\Delta=100\rightarrow \sqrt{\Delta}=10\\\\x_1=\frac{-4-10}{2}\ \vee \ x_2=\frac{-4+10}{2}\\\\x_1=-7\ \vee \ x_2=3\\\\[/tex]
Odp.
x ∈ <-7;3>