Problem 4. Let A be an n x n matrix such that A² = I, where I is the n x n identity matrix. (a) What is det A? (b) What is A-¹?

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A: L varies directly as h, and L=56 when h=7, find L when h=3.

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A: det(M) =3 Explanation:Step 1:

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Q: Question 8. Show work and solve, thanks.

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A: For the matrix-A=⎣⎢⎡​1−23​010​102​⎦⎥⎤​A−1=⎣⎢⎡​−2−43​010​121​⎦⎥⎤​So option (d) is…

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A: