Mějme funkci f(x) = 3x + 2. Čemu se rovná x, pokud zároveň platí f(x) = 3 · (f(x)-8) -4?
Správná odpověď je: C
V tomto případě máme dva různé předpisy funkce f, které platí současně. Pokud první předpis dosadíme do levé i pravé strany druhého předpisu, tak získáme jednu rovnici o jedné neznámé, kterou lze řešit:
3x + 2 = 3 · (3x + 2 – 8) – 4
Řešením této rovnice se dostaneme k výsledku, že x = 4.
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