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b- bok drugiego kwadratu
b=a+3
(a+3)^2=a^2+57
a^2+6a+9=a^2+57
a=8
b=11
obwod pierwszego kwadratu to:
Ob=4*8=32
obwod drugiego kwadratu to:
Ob=4*11=44
a-b=3
a²-b²=57
(a-b)(a+b)=57
3(a+b)=57
a+b=19
a+b=19
a-b=3
-------
2a=22
a=11 cm
b=8 cm
obwody wynoszą:32 cm i 44cm