, Jeżeli kazdy bok kwadratu zwiekszymy o 2 cm , to pole kwadratu powiekszy sie o 28cm^ , Oblicz dlugosc boku tego kwadratu. :)
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a - bok kwadratu
(a+2)² = a²+28
a²+4a+4 = a²+28
4a+4 = 28
4a = 28-4
4a = 24 |:4
a = 6 [cm]