5 (2 Points) Let TO |X1 + X2 X3] X2 + xz. ga , and s=(Pxz]) = (72 xia), then (S • T) will be: 1 A. (1 3) B. (1 - : c.12 3 0 -31 0 ) D.2 1 -1 2 Enter your answer
6 (2 Points) The system of equations that is equivalent to the given vector equation 5 3 X1 -5 + X20 8 2 -4 0 5x1 + 3x2 = 9, - 5x1 0 5x1 + 3x2 = 2, - 5x1 0 5x1 + 3x2 = 2, - 5x1 + 0 5x1 + 3x2 = - -4, - 5x1
7 (2 Points) [a b 21 For which values of a and b the following matrix is symmetric 3 1 L2 a 3 a O a=3 and b=3 a=2 and b=2 O a=1 and b=3 a=1 and b=2