Formula
Determinant of a 2×2 matrix
- the four entries, read row-wise
The determinant of a two by two matrix is the product of the leading diagonal minus the product of the other diagonal.
65
questions use it
37
of them past-year
2017–2026
years it has appeared
17%
rated HARD
4
exams
Used alongside
How often each of these appears in the same solution as this one.
65 questions whose solution uses this
Every one was read individually — a question is here because its solution invokes this, not because the stem mentions it.
Every identity this chapter tests, with its own question set.
All Matrices & Determinants formulas