Online calculator: Determinant of 3x3 matrices
https://planetcalc.com/157The determinant is a value defined for a square matrix. It is essential when a matrix is used to solve a system of linear equations (for example Solution of a system of 3 linear equations ). The determinant of 3x3 matrix is defined as Determinant of 3x3 matrices a11 a12 a13 a21 a22 a23 a31 a32 a33 Calculation precision
Determinant -- from Wolfram MathWorld
https://mathworld.wolfram.com/Determinant.html17.12.2021 · Determinant. Determinants are mathematical objects that are very useful in the analysis and solution of systems of linear equations.As shown by Cramer's rule, a nonhomogeneous system of linear equations has a unique solution iff the determinant of the system's matrix is nonzero (i.e., the matrix is nonsingular). For example, eliminating , , and from the equations