Jika matriks
A = ⎧3 1⎫ dan B = ⎧–2 –3⎫
⎩2 2⎭ ⎩3 4⎭
Pembahasan:
AB = ⎧3 1⎫⎧–2 –3⎫
⎩2 2⎭⎩3 4⎭
AB = ⎧–7 5⎫
⎩4 –3⎭
AB⁻¹ = 1 ⎧–7 5⎫
(–3)(–7) – (–5)(–4)⎩4 –3⎭
= 1 ⎧–7 5⎫
21 – 20 ⎩4 –3⎭
= ⎧–7 5⎫
⎩4 –3⎭