Choose the best answer for each question:
1 The LU decomposition is
2 Is it true that any matrix can be factorized to LU form without pivoting?
3 If A = LU then, det(a) equals:
4 The computational cost of the LU decomposition of an n × n {\displaystyle n\times n} matrix is:
5 The number of operations to solve Ax=b when we know L, U is