Úloha ID 459 - 
Hodnoty trojčlenu x2+x+11 pro x = {-9, -8, -7 ... 1, 2, 3, 4, 5, 6, 7, 8, 9} jsou vždy:
Správná odpověď je: B
Pokud má kvadratická funkce (x2 + bx + c) a kladné číslo, pak vždy roste. Jelikož je c = 11, pak celý graf musí mít kladný obor hodnot.
Zkouškou pro čísla ze zadání nám vycházejí lichá čísla (což je podmínkou, protože všechna prvočísla kromě 2 musí být lichá a protože c=11, tak ke každému výsledku x2 + bx přičítáme číslo 11 a celý graf to posunuje výrazně nad hodnotu 10, takže dvojku stejně nepotkáme).
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