Respostas

2014-07-23T19:35:09-03:00
Gente me ajuda a resolver ai                 a) x(x+1)=0 
                b) 2x(x-5)=0
                c)  (x+3)(x-1)=0
                d) (x-6)(4x-8)=0   

a) x(x+1) = 0
x = 0
e
(x+1) = 0
x + 1 = 0
x = - 1

x' = 0
x" = - 1

b) 2x(x-5)=0

2x( x- 5) = 0
2x = 0
x = 0/2
x = 0

e

(x-5) = 0
x - 5 = 0
x = + 5

x' = 0
x" = 5

c)  (x+3)(x-1)=0
(x+3) = 0
x + 3 = 0
x = -3
e
(x-1) = 0
x - 1 = 0
x = + 1

x' = - 3
x" = 1


d) (x-6)(4x-8)=0   

(x-6) = 0
x - 6 = 0
x = + 6
e
(4x-8) = 0
4x - 8 = 0
4x = 8
x= 8/4
x = 2

x' = 6
x" = 2