Question

resolva a equação irracional, sendo U=R. 5x-1= x+7

a)x=15
b)x=1
c)x=3
d)x=2

Answer 1

5x - 1 = x + 7
5x -x = 7+1
4x = 8
x=8/4
x = 2

Answer 2

5x - 1 = x + 7
5x - x = 7 + 1
4x = 8
x = 8/4
x = 2

Resposta "d)"