8. Let A = 121 122] 1_ ſau 012] (a) Show that A is nonsingular provided…

8. Let A = 121 122] 1_ ſau 012] (a) Show that A is nonsingular provided a 11022 – 012021 + 0. (b) If a11022 – 012021 = 0, show that A-1 = 4-1 _ 1 [ 222 -012] 011022 – Q12021 (-021 011