could you explain why he doesn't circle the don't care condition
where is the yellow circle?...
9. Joint Optimization (3 x 5p each 15p) The outputs f and g of a two-output circuit are specified with the following expressions: f (a, b, c, d)-Σm(1, 4, 5, 8, 15) + D(0, 2, 6, 9) g (a, b, c, d)-2m(0, 4, 5,10, 15) + D(2, 8, 9, 11) (a) Draw the K-map for f andab the K-map fors o CL R o0 DI Text (b) Derive the jointly optimized SOP expressions for fand g such that the two expressions share two implicants. Note that these are not necessarily prime implicants.