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+#Example3.1,chapter4,section1,page 329
+X <- matrix(c(4,-2,2,6),ncol = 2)
+#scalars come out of each row separately,not from the entire matrix at once.
+#so X will become
+A <- matrix(c(2,-1,1,3),ncol = 2)
+#with scalars 2 & 2 coming out of rows 1 and 2 respectively
+c <- det(X)
+d <- 4*det(A)
+all.equal(c,d)