Resposta :
Resposta:
-x² -4x +5 = 0
a= -1 b= -4 c= 5
Δ= b²-4.a.c
Δ= (-4)² -4 . (-1).5
Δ= 16 +20
Δ= 36
x=-b±√Δ/2.a
x= -(-4)±√36/2.(-1)
x = 4 ±6/-2
x'= 4-6/-2
x'= -2/-2
x'= 1
x"= 4+6/-2
x" = 10/-2
x" = -5
s = {1,-5}
Resposta:
-x² -4x +5 = 0
a= -1 b= -4 c= 5
Δ= b²-4.a.c
Δ= (-4)² -4 . (-1).5
Δ= 16 +20
Δ= 36
x=-b±√Δ/2.a
x= -(-4)±√36/2.(-1)
x = 4 ±6/-2
x'= 4-6/-2
x'= -2/-2
x'= 1
x"= 4+6/-2
x" = 10/-2
x" = -5
s = {1,-5}