20. A particular solution x(t) to the nonhomogeneous linear system x' = is A. B. A = ( ) = ( ) x(t) = (1/2) g= =t x(t) = −(t + 1) (1/2) C. x,(t) = -t +(1/2) D. xp(t)= E. :-(e² - 21) (1/2) == |x(t) = =-t · (1/2) - (1/4) Ax+g, where