(a). TRUE If l D l is nonzero, then D^{-1} exists. So, Dx = b has the unique solution x = D^{-1}b.

Note that if D is n x n, then x and b are n x 1 column vectors.

(c). FALSE If l D l = 0, then D is not invertible.

(b) FALSE If v is an eigenvector corresponding to λ, then so is kv (k ≠ 0).

(d) TRUE See part (b).

Fizaa A.

So would it be C because the determinant is zero and it can't be 0?08/12/20