Question

Qual é a soma das raizes da funçao f)-x^2+2x+8?
A) -3
B) 2
C) 1
D) 6
E) 9

Answer 1

a= -1
b= 2
c= 8

b^2-4.a.c
2^2-4.(-1).8
4+32
deltar= 36

-b+-raiz de delta/2.a

-2+-raiz de 36/2.(-1)

x' = -2+6/-2
+4/-2= -2

x"= -2-6/-2
-8/-2= +4

-2+4= 2

Answer 2

a=-1
b=2
c= 8

Delta = b^2 - 4ac
Delta = 4 + 32
Delta = 36

X 1 =( -2 + 6)/-2
X1 = - 2

x2 = (-2 -6 )/-2
x2 = 4

X1 + x2 =
- 2 + 4
= 2
Letra B

Abc e bons estudos !