Question

Se da mulţimea A={x(apartine)R| |2x-1|<3}.Enumerati elementele multimii

Answer 1

|2x-1|<3
-3<2x-1<3
-2<2x<4
-1<x<2 deci A=(-1,2)

Answer 2

cazul I
2x-1=3
2x3+1
x=4/2
x=2

cazul II
2x-1=-3
2x=-3+1
x=-2/2
x=-1
S={-1,2}
A={-1,2}