Precalculus Examples

Step 1
The inverse of a matrix can be found using the formula where is the determinant.
Step 2
Find the determinant.
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Step 2.1
The determinant of a matrix can be found using the formula .
Step 2.2
Simplify the determinant.
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Step 2.2.1
Simplify each term.
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Step 2.2.1.1
Multiply by .
Step 2.2.1.2
Multiply by .
Step 2.2.2
Add and .
Step 3
Since the determinant is non-zero, the inverse exists.
Step 4
Substitute the known values into the formula for the inverse.
Step 5
Multiply by each element of the matrix.
Step 6
Simplify each element in the matrix.
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Step 6.1
Multiply by .
Step 6.2
Multiply by .
Step 6.3
Combine and .
Step 6.4
Move the negative in front of the fraction.
Step 6.5
Cancel the common factor of .
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Step 6.5.1
Cancel the common factor.
Step 6.5.2
Rewrite the expression.
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