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The determinant calculator simplifies the process of finding the determinants for matrices of order up to 5×5 size. Select the size of the matrix and put either real or complex numbers to evaluate their determinant matrix with the calculations for each step.
It is a scalar values that is obtained from the elements of the square matrix. It has certain properties of the linear transformation and measures how much a linear transformation indicated by the matrix stretches.
The determinant of a matrix is positive or negative depend on whether linear transformation preserves or reverses the orientation of a vector space. It is denoted as det (A), det A, or |A|.
The determinant of the matrices can be calculated from the different methods but the determinant calculator computes the determinant of a 2×2, 3×3, 4×4 or higher-order square matrix.
The calculator takes the complexity out of matrix calculations, making it simple and easy to find determinants for matrices of any size. In simple manually, it is calculated by multiplying its main diagonal members & reducing matrix to row echelon form.
Here we give the detailed formulas for different order of matrix to find the determinant from different methods:
No matter, which method you selected for the calculations, the determinant of matrix A = (aij)2×2 is determined by the following formula:
\(
det A =
\begin{vmatrix}
a & b \\
c & d
\end{vmatrix} \\
\)
\(det A = ad-bc \)
Example:
Find determinant of 2×2 matrix A
\(
det A =
\begin{vmatrix}
4 & 12 \\
2 & 7
\end{vmatrix} \\
\)
Solution:
\(|A| = (7)(4) – (2)(12)\)
\(|A| = 28 – 24\)
\(|A| = 4\)
For the calculations of matrix A = (aij)3×3 from expansion of column is determined by the following formula:
\(
det A =
\begin{vmatrix}
a & b & c\\d & e & f \\g & h & i
\end{vmatrix} \\
\)
\(det A= a\begin{vmatrix}
e & f \\h & i\end{vmatrix} – d\begin{vmatrix}b & c \\h & i\end{vmatrix}+g\begin{vmatrix}b & c \\e & f\end{vmatrix} \)
Example:
\(
det A =
\begin{vmatrix}
2 & 0 & 3\\1 & 4 & 1 \\0 & 4 & 7
\end{vmatrix} \\
\)?
Solution:
\(det A= 2\begin{vmatrix}
4 & 1 \\4 & 7\end{vmatrix} – 1\begin{vmatrix}0 & 3 \\4 & 7\end{vmatrix}+0\begin{vmatrix}0 & 3 \\4 & 1\end{vmatrix} \)
\( det A = 2[(7)(4)-(4)(1)]-1[(4)(3)-(7)(0)]+ 0[(4)(3)-(1)(0)] \)
\( det A = 2[28-4]-1[12-0]+ 0[12-0] \)
\( det A = 2[24]-1[12]+ 0[12] \)
\( det A = 48-12+ 0 \)
\( det A = 36 \)
For the calculations of matrix A = (aij)4×4 from expansion of column is determined by the following formula:
\(
det A =
\begin{vmatrix}
a & b & c & d\\e & f & g &h \\i & j & k & l \\ m & n & o & p
\end{vmatrix} \\
\)
\(det A= a\begin{vmatrix}
f & g & h\\j & k & l\\n & o & p\end{vmatrix} – e\begin{vmatrix}b & c & d\\j & k & l\\ n & o & p\end{vmatrix}+i\begin{vmatrix}b & c & d \\f & g & h\\n & o & p\end{vmatrix}-m\begin{vmatrix}b & c & d\\f & g & h\\j & k & l\end {vmatrix}\)
Then, simply determine the determinant of 3×3 by using above formula of 3×3.
Example:
\(
det A =
\begin{vmatrix}
1 & 8 & 7 & 2\\2 & 4 & 3 &8 \\1 & 4 & 3 & 2 \\ 1 & 4 & 9 & 6
\end{vmatrix} \\
\)?
Solution:
\(det A= 1\begin{vmatrix}4 & 3 & 8\\4 & 3 & 2\\4 & 9 & 6\end{vmatrix} – 2\begin{vmatrix}8 & 7 & 2\\4 & 3 & 2\\ 4 & 9 & 6\end{vmatrix}+1\begin{vmatrix}8 & 7 & 2 \\4 & 3 & 8\\4 & 9 & 6\end{vmatrix}-1\begin{vmatrix}8 & 7 & 2\\4 & 3 & 8\\4 & 3 & 2\end {vmatrix}\)
\(det A=1( 4\begin{vmatrix}
3 & 2 \\9 & 6\end{vmatrix} – 3\begin{vmatrix}4 & 2 \\4 & 6\end{vmatrix}+8\begin{vmatrix}4 & 3 \\4 & 9\end{vmatrix}) -2( 8\begin{vmatrix}
3 & 2 \\9 & 6\end{vmatrix} – 7\begin{vmatrix}4 & 2 \\4 & 6\end{vmatrix}+2\begin{vmatrix}4 & 3 \\4 & 9\end{vmatrix}) +1( 8\begin{vmatrix}3 & 8 \\9 & 6\end{vmatrix} – 7\begin{vmatrix}4 & 8 \\4 & 6\end{vmatrix}+2\begin{vmatrix}4 & 3 \\4 & 9\end{vmatrix}) -1( 8\begin{vmatrix}
3 & 8 \\3 & 2\end{vmatrix} – 7\begin{vmatrix}4 & 8 \\4 & 6\end{vmatrix}+2\begin{vmatrix}4 & 3 \\4 & 3\end{vmatrix})\)
\(det A = 1[4(18-18)-3(24-8)+ 8(36-12)]-2[ 8(18-18)-7(24-8)+ 2(36-12)]+ 1[ 8(18-72)-7(24-32)+2(36-12)] -1[8(6-24)-7(8-32)+ 2(12-12)]\)
\(det A = 1[4(0)-3(16)+ 8(24)]-2[ 8(0)-7(16)+ 2(24)]+ 1[ 8(-54)-7(-8)+ 2(24)]-1[8(-18)-7(-24)+ 2(0)]\)
\(det A = 1[0-48+192]-2[0-112+48]+ 1[ -432+56+48]-1[-144+168+0]\)
\(det A = 1[144]-2[-64]+ 1[-328]-1[24]\)
\(det A = 144+128-328- 24\)
\(det A = -80\)
For the calculations of matrix A = (aij)5×5 from expansion of column is determined by the following formula:
\(
det A =
\begin{vmatrix}
a & b & c & d & e\\f & g & h & i & j\\k & l & m & n & o \\ p & q & r & s & t \\ u & v & w & x & y
\end{vmatrix} \\
\)
\(det A= a\begin{vmatrix}
g & h & i & j\\l & m & n & o\\q & r & s & t\\v & w & x & y\end{vmatrix} – f\begin{vmatrix}b & c & d & e\\l & m & n & o\\ q & r & s & t\\ v & w & x & y\end{vmatrix}+k\begin{vmatrix}b & c & d & e \\g & h & i & j\\q & r & s & t\\v & w & x & y\end{vmatrix}-p\begin{vmatrix}b & c & d & e\\g & h & i & j\\l & m & n & o\\q & r & s & t\end {vmatrix}\)
From the source of Wikipedia : Definition of determinant & applications
From the site of Semath : Determinant of 5 by 5
Other languages: Determinant Hesaplama, Kalkulator Wyznacznika Macierzy, Kalkulator Penentu Matriks, Determinanten Rechner, 行列式 計算, 행렬식 계산기, Determinant Kalkulačka, Calculadora De Determinantes, Calcul Déterminant Matrice, Calculadora De Determinantes, Calcolo Determinante, Калькулятор Определителя, حساب محدد, Determinantti laskin, Determinantberegner.