Tuesday, August 13, 2013

What are the elements of the set whose properties is |x-2|=

l x-2 l =< 3


Then we
have two cases:


(x-2) =< 3     OR   -(x-2) =
< 3


Let us solve each
case:


case (1):


x-2 =<
3


add 2 to both
sides:


==> x =<
5


==> since x is an integer,
Then:


x= { -inf, ....,
-1,0,1,2,3,4,5}.........(1)



Case(2):


-(x-2)
=< 3


==> -x + 2 =<
3


subtract 2 :


==> -x
=< 1


Now multiply by
-1:


==> x >=
-1


==> x= { -1, 0, 1, ....,
inf}.........(2)


Now the solution
is:


x = (1) and
(2)


==> x = { -1, 0, 1, 2, 3, 4,
5}

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