Find all constant solutions x(t) = [x1(t); x2(t); x3(t)] (i.e. x1, x2, x3 are actually constant functions) to the following system of differential equations x' = [2 0 -1; 1 1 2; 0 0 0]x. Note that the columns of this matrix is the same as the three vectors in part (b). Hint: what is x'(t) when x(t) is constant?