Question

If A = 3 -3 4 , then show that A^-1=A^3
2 -3 4
0 -1 1​

Answer 1

Answer:

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Answer 2

A = ⎡ ⎢ ⎣ 3 − 3 4 2 − 3 4 0 − 1 1 ⎤ ⎥ ⎦ A=[3−342−340−11] |A| = 3 + 6 – 8 = 1 Cofactors of A are: C11 = 1 C21 = – 1 C31 = 0 C12 = – 2 C22 = 3 C32 = – 4 C13 = – 2 C23 = 3 C33 = – 3 Hence, A–1 = A3