Răspuns:
l-2x+4l=3=>
-2x+4=±3
a) -2x+4≥0 -2x≥-4 x≤(-4)/(-2 x≤2
-2x+4= 3 -2x=3-4 -2x= -1 x= (-1)/(-2)=1/2≤2
x=1/2
b.-2x+4<0 x>2
-2x+4= -3
-2x=-3-4
-2x= -7
x= -7/(-2)= 3,5 >2
x={1/2, 3,5}
Explicație pas cu pas:
|-2x+4|=3
1. -2x+4= -3
-2x= -3-4
-2x= -7
x=7/2
2. -2x+4=3
-2x=3-4
-2x= -1
x=1/2
S={7/2,1/2}