Question

|x|=17
|x|=-2
|2x-3|=7
|5-8x|=35
Rezolvati aceste ecuatii in multimea Z ecuatiile

Answer 1

1. X = {17; - 17}

2. X = 0

3. 2x-3= D7. D7 ={1,-1,7-,7}
2x-3 =1
2x=1+3 =>2x=4 => x= 4:2 =>x=2
2x-3=-1
2x=-1+3 =>2x= 2=>x=2:2 =>x= 1
2x-3=7
2x=7+3 =>2x= 10=>x= 10:2=>x=5
2x-3=-7 =>2x=-7+3=>2x=-4=>x=-4:2=>x= - 2
x={2;1;5;-2}