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P₁ = x² - pole 1 kwadratu
x + 2 - bok 2 kwadratu
P₂ = (x + 2)² - pole 2 kwadratu
P₂ = (x + 2)² = x² + 2x + 4
P = P₁ + P₂
P = x² + x² + 2x + 4
P = 2x² + 2x + 4