Some help on these questions... much appreciated!

Give two distinct 2 x 2 matrices, A and B, whose product is the zero matrix. That is, AB =0 and neither A nor B is the zero matrix.Prove that for any two distinct invertible 2 x 2 matrices, A and B, their product cannot be the zero matrix. Below are three invertible matrices P, Q and R. P R - 1 31 i. Show that (PQR)" - RTQ" PT. ii. What restriction should be placed on the value of a