$\"\"$

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The matrices are $\"\"$ and $\"\"$ .

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If $\"\"$ and $\"\"$ are inverses, then $\"\"$

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Find the product $\"\"$ .

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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$\"\"$ (Distribute the scalar: $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Simplify)

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$\"\"$

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Since $\"\"$ , they are not inverses. $\"\"$

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The matrices are not inverses.