$\"\"$

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The matrices are

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

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$\"\"$ (Multiply)

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$\"\"$ (Simplify)

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

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$\"\"$

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The matrices are not inverses.