Find l.u.b.and g.l.b.,if exist,for set{1/1+x sq.:-5 less than eql.x l.th.eql.1}(B.Sc.I.DC 14.H R B)

Find the l.u.b. and g. l. b., if they exist, for the set
{1 upon 1 plus x square : minus 5 less than equal to x less than equal to 1}.
B. Sc. I. D C 14.
HUKAM RAJ BHAGAT.
@hukamrajbhagat9437.