Examples

Find the Eigenvectors/Eigenspace
Step 1
Find the eigenvalues.
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Step 1.1
Set up the formula to find the characteristic equation .
Step 1.2
The identity matrix or unit matrix of size is the square matrix with ones on the main diagonal and zeros elsewhere.
Step 1.3
Substitute the known values into .
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Step 1.3.1
Substitute for .
Step 1.3.2
Substitute for .
Step 1.4
Simplify.
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Step 1.4.1
Simplify each term.
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Step 1.4.1.1
Multiply by each element of the matrix.
Step 1.4.1.2
Simplify each element in the matrix.
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Step 1.4.1.2.1
Multiply by .
Step 1.4.1.2.2
Multiply .
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Step 1.4.1.2.2.1
Multiply by .
Step 1.4.1.2.2.2
Multiply by .
Step 1.4.1.2.3
Multiply .
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Step 1.4.1.2.3.1
Multiply by .
Step 1.4.1.2.3.2
Multiply by .
Step 1.4.1.2.4
Multiply by .
Step 1.4.2
Add the corresponding elements.
Step 1.4.3
Simplify each element.
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Step 1.4.3.1
Subtract from .
Step 1.4.3.2
Add and .
Step 1.4.3.3
Add and .
Step 1.4.3.4
Subtract from .
Step 1.5
Find the determinant.
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Step 1.5.1
The determinant of a matrix can be found using the formula .
Step 1.5.2
Simplify each term.
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Step 1.5.2.1
Rewrite using the commutative property of multiplication.
Step 1.5.2.2
Multiply by by adding the exponents.
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Step 1.5.2.2.1
Move .
Step 1.5.2.2.2
Multiply by .
Step 1.5.2.3
Multiply by .
Step 1.5.2.4
Multiply by .
Step 1.5.2.5
Multiply by .
Step 1.6
Set the characteristic polynomial equal to to find the eigenvalues .
Step 1.7
Solve for .
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Step 1.7.1
Add to both sides of the equation.
Step 1.7.2
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 1.7.3
Any root of is .
Step 1.7.4
The complete solution is the result of both the positive and negative portions of the solution.
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Step 1.7.4.1
First, use the positive value of the to find the first solution.
Step 1.7.4.2
Next, use the negative value of the to find the second solution.
Step 1.7.4.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 2
The eigenvector is equal to the null space of the matrix minus the eigenvalue times the identity matrix where is the null space and is the identity matrix.
Step 3
Find the eigenvector using the eigenvalue .
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Step 3.1
Substitute the known values into the formula.
Step 3.2
Simplify.
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Step 3.2.1
Subtract the corresponding elements.
Step 3.2.2
Simplify each element.
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Step 3.2.2.1
Subtract from .
Step 3.2.2.2
Subtract from .
Step 3.2.2.3
Subtract from .
Step 3.2.2.4
Subtract from .
Step 3.3
Find the null space when .
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Step 3.3.1
Write as an augmented matrix for .
Step 3.3.2
Find the reduced row echelon form.
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Step 3.3.2.1
Multiply each element of by to make the entry at a .
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Step 3.3.2.1.1
Multiply each element of by to make the entry at a .
Step 3.3.2.1.2
Simplify .
Step 3.3.2.2
Perform the row operation to make the entry at a .
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Step 3.3.2.2.1
Perform the row operation to make the entry at a .
Step 3.3.2.2.2
Simplify .
Step 3.3.3
Use the result matrix to declare the final solution to the system of equations.
Step 3.3.4
Write a solution vector by solving in terms of the free variables in each row.
Step 3.3.5
Write the solution as a linear combination of vectors.
Step 3.3.6
Write as a solution set.
Step 3.3.7
The solution is the set of vectors created from the free variables of the system.
Step 4
Find the eigenvector using the eigenvalue .
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Step 4.1
Substitute the known values into the formula.
Step 4.2
Simplify.
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Step 4.2.1
Add the corresponding elements.
Step 4.2.2
Simplify each element.
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Step 4.2.2.1
Add and .
Step 4.2.2.2
Add and .
Step 4.2.2.3
Add and .
Step 4.2.2.4
Add and .
Step 4.3
Find the null space when .
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Step 4.3.1
Write as an augmented matrix for .
Step 4.3.2
Find the reduced row echelon form.
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Step 4.3.2.1
Perform the row operation to make the entry at a .
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Step 4.3.2.1.1
Perform the row operation to make the entry at a .
Step 4.3.2.1.2
Simplify .
Step 4.3.3
Use the result matrix to declare the final solution to the system of equations.
Step 4.3.4
Write a solution vector by solving in terms of the free variables in each row.
Step 4.3.5
Write the solution as a linear combination of vectors.
Step 4.3.6
Write as a solution set.
Step 4.3.7
The solution is the set of vectors created from the free variables of the system.
Step 5
The eigenspace of is the list of the vector space for each eigenvalue.
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