6 ) if the matrix Am is symmetric, show that A is also symmetric. IF A non is idempotent show that A is also idempotent . 8 ) Show that the matrix 2 - 1 - B = - 2 3 - 2 4 - 3 is idempotent .9) Use the Gauss elimination algorithm to find the Solution to the system X, t x z t x3 = 6 2x, - 1 3 3 x2 + X3 = 9 10 ) if A is symmetric , show that AM is also symmetric