Determinant of a 2×2 matrix
Guided practice — solve each problem, check, then generate a fresh one.
Formula to apply
det [[a, b], [c, d]] = ad − bc
Problem
Compute the determinant of the matrix
[ 3 -4 ]
[ 3 -2 ]
Working
- 1det = a·d − b·c = 3·-2 − -4·(3).
- 2= -6 − (-12) = 6.