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(x+5)^2=x^2+125
x²+10x+25=x²+125
x²+10x-x²=125-25
10x=100 |:10
x=10
Odp: Bok tego kwadratu ma długość 10 cm.
(a+5)2=p+125
a2 +10a+25 =a2 +125
10a+25=125
10a=100
a=10
P=a.a=10.10=100