Examples
Step 1
Set up the formula to find the characteristic equation .
Step 2
The identity matrix or unit matrix of size is the square matrix with ones on the main diagonal and zeros elsewhere.
Step 3
Step 3.1
Substitute for .
Step 3.2
Substitute for .
Step 4
Step 4.1
Simplify each term.
Step 4.1.1
Multiply by each element of the matrix.
Step 4.1.2
Simplify each element in the matrix.
Step 4.1.2.1
Multiply by .
Step 4.1.2.2
Multiply .
Step 4.1.2.2.1
Multiply by .
Step 4.1.2.2.2
Multiply by .
Step 4.1.2.3
Multiply .
Step 4.1.2.3.1
Multiply by .
Step 4.1.2.3.2
Multiply by .
Step 4.1.2.4
Multiply by .
Step 4.2
Add the corresponding elements.
Step 4.3
Simplify each element.
Step 4.3.1
Subtract from .
Step 4.3.2
Add and .
Step 4.3.3
Add and .
Step 5
Step 5.1
The determinant of a matrix can be found using the formula .
Step 5.2
Simplify the determinant.
Step 5.2.1
Simplify each term.
Step 5.2.1.1
Apply the distributive property.
Step 5.2.1.2
Multiply by .
Step 5.2.1.3
Rewrite using the commutative property of multiplication.
Step 5.2.1.4
Simplify each term.
Step 5.2.1.4.1
Multiply by by adding the exponents.
Step 5.2.1.4.1.1
Move .
Step 5.2.1.4.1.2
Multiply by .
Step 5.2.1.4.2
Multiply by .
Step 5.2.1.4.3
Multiply by .
Step 5.2.1.5
Multiply .
Step 5.2.1.5.1
Multiply by .
Step 5.2.1.5.2
Multiply by .
Step 5.2.2
Reorder and .