The matrix you pasted
[[ 1, 8, 50],
[ 8, 64, 400],
[ 50, 400, 2500]]
Has a determinant of zero. This is the definition of a Singular matrix (one for which an inverse does not exist)
http://en.wikipedia.org/wiki/Invertible_matrix
The matrix you pasted
[[ 1, 8, 50],
[ 8, 64, 400],
[ 50, 400, 2500]]
Has a determinant of zero. This is the definition of a Singular matrix (one for which an inverse does not exist)
http://en.wikipedia.org/wiki/Invertible_matrix