Question

Encontre as raízes da equação do primeiro grau: a) 7(2x -1) = 4(x + 10) b) 3(x - 1) + 2(x + 1) = 4(x+2) c) 4(x + 1) + 3(2x – 3) = 4( x – 1) + 8

Answer 1

a)

7(2x - 1)= 4(x + 10)

14x - 7= 4x + 40

14x - 4x= 40 + 7

10x= 47

x= 47/10

b)

3(x - 1) + 2(x + 2)= 4(x + 2)

3x - 3 + 2x + 4= 4x + 8

3x + 2x - 4x= 8 + 3 - 4

1x= 7

x= 7/1

x= 7

c)

4(x + 1) + 3(2x - 3)= 4(x - 1) + 8

4x + 4 + 6x - 9= 4x - 4 + 8

4x + 6x - 4x= - 4 + 8 - 4 + 9

6x= 9

x= 9/6

x= 3/2