Odgovor: #aos = (-5) / 2 # vrh: #(-5/2,-73/4)# Obrazloženje: U obliku: # Y = x ^ 2 + bx + c # os simetrije je: #aos = (-b) / 2 # # y = x ^ 2 + 5x - 12 # #aos = (-5) / 2 # Vrh je: # (aos, f (aos)) = (-5/2, (f (-5/2)) # # y = (-5/2) ^ 2 + 5 (-5/2) - 12 = -73 / 4 # vrh: #(-5/2,-73/4)# graf {y = x ^ 2 + 5x-12 -20,25, 19,75, -21,44, -1,44}