12,20,30,42,56
Pola 1 = +8+10+12+14 dst
Pola 2 = +2+2+2 dst
a = 12
b = 8
c = 2
Un = 12 + 8(n-1) + 2(n-1) (n-2)/2
Un = 12 + 8n-8 + n²-3n+2
Un = n² + 5n + 6
U22 = 22² + 5(22)+6
U22 = 484 + 110 + 6
U22 = 600
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12,20,30,42,56
Pola 1 = +8+10+12+14 dst
Pola 2 = +2+2+2 dst
a = 12
b = 8
c = 2
Un = 12 + 8(n-1) + 2(n-1) (n-2)/2
Un = 12 + 8n-8 + n²-3n+2
Un = n² + 5n + 6
U22 = 22² + 5(22)+6
U22 = 484 + 110 + 6
U22 = 600