Discussion Board 2: C25, page 353 (Computing Determinants)

C25-Doing the computations by hand, find the determinant of the matrix below.

A<-rbind(c(3,-1,4),c(2,5,1), c(2,0,6))
print(A)

##      [,1] [,2] [,3]
## [1,]    3   -1    4
## [2,]    2    5    1
## [3,]    2    0    6

det(A)

## [1] 60

The formula to get the determinant is |A| = a(ei − fh) − b(di − fg) + c(dh − eg)