Show that A=-8524 satisfies the equation A2+4A-42I=0. Hence, find A-1.

Show that $A = [\begin{matrix} - 8 & 5 \\ 2 & 4 \end{matrix}]$ satisfies the equation $A^{2} + 4 A - 42 I = 0 .$ Hence, find $A^{- 1}$ .

Matching exercise

Match the items on the right to the items on the left.

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Step 6