(1) Encontre as raízes das equações a seguir.
a) (x + 5)(x + 3) = 0
b) (x + 8).(x + 4) = 0
c) (x + 2)(x + 7) = 0
d)(x - 6).(x - 9) = 0
e)(x - 13).(x - 7) = 0
f) (x - 2).(X - 5) = 0
g) (x + 6).(x - 2) = 0
h) (x + 5).(x - 7) = 0
i) (x + 4).(x - 8) = 0
j) (x - 12).(x + 1) = 0
k) (X - 9) (x + 6) = 0
1) (x - 1).(x + 1) = 0
Soluções para a tarefa
(A)
(x + 5).(x + 3) = 0
x + 5 = 0
x = 0 - 5
x = - 5
x + 5 = 0
x = 0 - 3
x = - 3
- S = {- 5, - 3}
------------------------
(B)
(x + 8).(x + 4) = 0
x + 8 = 0
x = 0 - 8
x = - 8
x + 4 = 0
x = 0 - 4
x = - 4
- S = {- 8, - 4}
------------------------
(C)
(x + 2).(x + 7) = 0
x + 2 = 0
x = 0 - 2
x = - 2
x + 7 = 0
x = 0 - 7
x = - 7
- S = {- 2, - 7}
------------------------
(D)
(x - 6).(x - 9) = 0
x - 6 = 0
x = 0 + 6
x = 6
x - 9 = 0
x = 0 + 9
x = 9
- S = {6, 9}
------------------------
(E)
(x - 13).(x - 7) = 0
x - 13 = 0
x = 0 + 13
x = 13
x - 7 = 0
x = 0 + 7
x = 7
- S = {13, 7}
------------------------
(F)
(x - 2).(x - 5) = 0
x - 2 = 0
x = 0 + 2
x = 2
x - 5 = 0
x = 0 + 5
x = 5
- S = {2, 5}
------------------------
(G)
(x + 6).(x - 2) = 0
x + 6 = 0
x = 0 - 6
x = - 6
x - 2 = 0
x = 0 + 2
x = 2
- S = {- 6, 2}
------------------------
(H)
(x + 5).(x - 7) = 0
x + 5 = 0
x = 0 - 5
x = - 5
x - 7 = 0
x = 0 + 7
x = 7
- S = {- 5, 7}
------------------------
(I)
(x + 4).(x - 8) = 0
x + 4 = 0
x = 0 - 4
x = - 4
x - 8 = 0
x = 0 + 8
x = 8
- S = {- 4, 8}
------------------------
(J)
(x - 12).(x + 1) = 0
x - 12 = 0
x = 0 + 12
x = 12
x + 1 = 0
x = 0 - 1
x = - 1
- S = {12, - 1}
------------------------
(k)
(X - 9).(x + 6) = 0
x - 9 = 0
x = 0 + 9
x = 9
x + 6 = 0
x = 0 - 6
x = - 6
- S = {9, - 6}
------------------------
(L)
(x - 1).(x + 1) = 0
x - 1 = 0
x = 0 + 1
x = 1
x + 1 = 0
x = 0 - 1
x = - 1
- S = {1, - 1}