) since rank of the matrix is 1, therefore, it should have at leastone non-zero determinant of order 1 and all the higher orderdeterminants should be zero. If x=0 A=(
0
0
0
0
0
0
0
0
1
) It has non zero determinant of order 1 only. If x=1 A=(
1
1
1
1
1
1
1
1
2
) It has a non zero determinant of order 2, nearly |