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najpierw wierzchołek:
delta = b^2-4ac = 136
x = -b/2a = 6
y = -delta/4a = -136/4 = -34
do równania wstawiam za x 1 i 8:
1^2 - 12*1 + 2 = -9
8^2 - 12*8 + 2 = 30
x = 1 --> y = -9
x = 8 --> y = -30
x = 6 --> y = -34
największa wartość dla x = 1 (-9); najmniejsza dla x =6 (-34)