Question

contas
2.(x+1)=4.(x-1)=0


5.(x+1)-3.(x+2)=0



13+4.(2x-1)=5.(x+2)=0



resultados que deveram dar
1)-3
2)1/2
3)1/3

Answer 1

Vamos lá!

● 2 . ( x + 1 ) = 4 . ( x - 1 )
2x + 2 = 4x - 4
2x - 4x = - 4 - 2
- 2x = - 6 . ( -1 )
2x = 6
x = 6/2
x = 3

● 5 . ( x + 1 ) - 3. ( x + 2 ) = 0
5x + 5 - 3x - 6 = 0
2x - 1 = 0
2x = 1
x = 1/2 ou x = 0, 5

● 13 + 4 . ( 2x + 1 ) = 5 . ( x + 2 )
13 + 8x + 4 = 5x + 10
17 + 8x = 5x + 10
17 - 10 = 5x - 8x
7 = - 3x . (-1)
- 7 = 3x
- 7/3 = x ou x= - 2,33...