Resposta :
-x²+10x-25=0 .(-1)
+x² -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
+x² -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