PRC-2 · Chapter 4 · Question 58 of 60
For a 2x2 matrix [[a, b], [c, d]], how do you find the 'Adjoint'?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) Swap 'a' and 'd', and change the signs of 'b' and 'c'.
Explanation
This is a standard shortcut for finding the adjoint of a 2x2 matrix without calculating cofactors.
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