Erlang question

A programmer tries to write a program that takes two pairs as inputs (x, Y and CA, B and computes X * Y and A that: B in parallel and then subtracts their results. For example, they expect program ( (2, 3, (4, 5) -14 The programmer writes the following: worker (P, D1, D2) > P!ID1 D2). program((x, Y), (A, B)> spawn (?MODULE, worker, [selfO, A, B]), spawn (?MODULE, worker, [self ), receive X >receive Y X- Y end end. However, the program does not work. Fix the program such that it also passes the above test case