1. We know from Theorem 5.4.10 that if an n × n matrix A satisfies | A |= 0, then there is some vector x, x = 0 such that Ax = 0. We also know from Corollary 5.7 2 that if matrix A has a row of zeros, say the i th row, then | A |= 0. Find x = 0 such that Ax = 0.