here is my problem x'={{0,1,0},{2,-1,0},{1,1,1}}x which I solved to give me a fundamental matrix of 1/9(3 e^(-2 t) (2 e^(3 t) + 1) | -3 e^(-2 t) (1 - e^(3 t)) | 0 -6 e^(-2 t) (1 - e^(3 t)) | 3 e^(-2 t) (e^(3 t) + 2) | 0 e^(-2 t) (-e^(3 t) t - e^(3 t) + 1) | -e^(-2 t) (-e^(3 t) t - e^(3 t) + 1) | 9 (e^t t + e^t)). the issue is that the last bit is not satisfied where x_3' should equal x_1+x_2+x_3