What is the count of arithmetic floating point operations for evaluating a matrix-vector product with an nn Householder matrix H when the representation (6) of H is used? Only u and are stored, not the entries of H. What is the count of arithmetic floating point operations for evaluating a matrix-vector product with H when the entries of H (but not u and ) are available? Correct orders of magnitude of the arithmetic work when n is large suffices. What is the count of arithmetic floating point operations for evaluating a matrix-vector product with an nn Householder matrix H when the representation (6) of H is used? Only u and are stored, not the entries of H. What is the count of arithmetic floating point operations for evaluating a matrix-vector product with H when the entries of H (but not u and ) are available? Correct orders of magnitude of the arithmetic work when n is large suffices