Resposta :

S = 10
P = 25
S: {5, 5}
 -x²+10x-25=0 .(-1)
+x
² -10x +25=0
 
a= 1    b= -10    c= +25
▲= b² -4.a.c= (-10)² -4.(1).(+25)= +100 - 100= 0

x= (- b ± √▲)/2.a
x= (-(-10) 
± √0)/2.1
x= (+10 ± 0)/2
x'= (+10 + 0)/2= 10/2= 5
x"= (10 - 0)/2= 10/2= 5

S: 5

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