Back to home
Math
3×3 Determinant
Expansion along the first row
Runs locally in your browser
Parameters
Results
- det(A)
- 1
How it works
Calculate the determinant of a 3×3 matrix by expansion along the first row.
Who it's for: Linear algebra students and anyone checking whether a matrix is invertible.
Uses cofactor expansion along row 1.
A determinant of zero means the matrix is singular (non-invertible).
Enter all nine elements a₁₁ through a₃₃.
How to use
- Fill in matrix elements row by row: a₁₁, a₁₂, a₁₃, then row 2, then row 3.
- Read det(A) as the determinant value.
Good to know
- det = 0 indicates linear dependence among rows or columns.