I suppose the title should be "Matrix polynomial T or F" but whatever. 1. The problem statement, all variables and given/known data True or false: if A2-2A+I=0, then A-1=2I2-I 3. The attempt at a solution My thought: A2-2A+I=0 becomes (A-I)(A-I)=0 so A = I The inverse of I is I. So the second equation: A-1=2I2-I becomes I = 2I2-I I2=I 2I-I = I So the answer is True. Where did I go wrong?