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a²=x²=pole kwadratu
1dm=10cm
a=1 bok prostokąta
a=x+3cm
b= 2 bok prostokąta
b=x-10cm
ab= pole prostok.ata
(x+3)(x-10)=pole prostokąta
x²+3x-10x-30=x²-7x-30
x²-7x-30+170=x²
-7x=30-170
-7x=-140
x=140:7
x=20
wymiary prostokąta:
a=x+3=20+3=23cm
b=x-10=20-10=10cm
obwód prostokąta=2a+2b=2×23+2×10=46+20=66cm