Question

a)|x-1|=2
b)|2x-6|= 0
c)|x-3|-5|=4
d)|-x|=3

Answer 1

a)|x-1|=2
x-1=2
x=2+1
x=3
x-1=-2
x=-2+1
x=-1
S={3;-1}
b)|2x-6|=0
2x-6=0
2x=6
x=6/2
x=3
S={0;3}
c)|x-3|-|5|=4
x-3-5=4
x=4+3+5
x=12
x-3-5=-4
x=-4+3+5
x=4
S={12;4}
d)|-x|=3
x=3
x=-3
S={3;-3}

Answer 2

a ) x = 2 + 1 =) x = 3 
b) 2x-6=0 =) 2x= 6 =) x= 3 ( Verificare : 2 x 3 = 6 -6 = 0 ) 
c) Nu inteleg
d) -x= 3 =) x apartine multimii ( -3 , 3 )