Let A be 3x3 matrix. Suppose 1 and -1 are two of the three Eigen Values of A and 18 is one of the Eigen Values of A2+3A. Then____
a.) Both A and A2+3A are invertible.
b.) A2+3A but A is not.
c.) A is invertible but A2+3A is not invertible.
d.) Both A and A2+3A are not invertible.