Basic rule in Matrix

Please explain the highlighted portion . Exactly which identity is used ?
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iTeachChem Helper
@Apu @Apu
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ri?reeeeeeeeeeeeeeeeeee
the one you got in the earlier step A^2 = 3 A
Say_miracle_shadow
Say_miracle_shadowOP7mo ago
Okay ..yes.. Thank you @ri?reeeeeeeeeeeeeeeeeee + solved @ri?reeeeeeeeeeeeeeeeeee
iTeachChem Helper
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