1 2 2 -1 0 1 1 3. Let A = I-1 -1 2 3 1 1 1 1 -2 0 -1 1 , find all win R that are mapped TO 0 1 1 1 into the zero vector by the transformation 7 HA?, that is find all a such that A?= 7. a 3 -6) 4. Let A = -1 2). Con . Construct a 2 matrix B such that AB is the zero matrix. Use two different nonzero columns for B. This is problem #12 from page 103 of the textbook. 1. Find the standard matrix for the linear transformation T defined by T(21, 12) = (2x1 - 3x2,0, 412 + 2x1).