You received a coded message in the matrix c =
30 30 69
2 1 15
9 14 20
however, the matrix d that will decode this
message has been corrupted, and you do not know the value of entry . you know that all entries in matrix d are
integers. using x to represent this unknown entry, the decoding matrix d is given by d =
2 x −4
−1 2 3
1 −1 −2
decode
the message in matrix c.