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a*(a+20) =2400
a²+20a - 2400 = 0
Δ= 20² - 4 * (-2400) = 400 + 9600 = 10 000
√Δ = 100
a₁ = -20 - 100/2 =-60 (odrzucamy, gdyż nie może być to liczba ujemna!)
a₂ = -20 + 100/2 =40
Działka ma wymiary 40m x 60m :)