Question

1: Resolva as equações
a)Ι-5xΙ = 20
b)Ι-x + 4Ι = 11
c)Ι2x - 7Ι = 5

Answer 1

a)|-5x|=20
-5x=+/-20
x=+/-4

B)|-x+4|=11
-x+4=+/-11
x= 4+11=15
ou
x=4-11=-7


C)|2x-7|=5
2x-7=+/-5
2x=5+7 ou 2x=7-5
2x=12 ou 2x=2
x=6 ou x=1