Subject: Mathematics
Book: Maths Mastery
For a 2×2 matrix M=[[a, b],[c, d]], its inverse, if it exists, is (1/det(M))×[[d, –b],[–c, a]], where det(M)=ad–bc. For instance, if M=[[1,2],[3,4]], det(M)=1×4–2×3=4–6=–2. So M⁻¹= (1/–2)×[[4,–2],[–3,1]]= [[–2,1],[1.5,–0.5]]. Checking if det(M)≠0 ensures invertibility. The inverse helps solve AX=B by X=M⁻¹B, and is used in transformations, cryptography, or advanced robotics. Mastering 2×2 inverses sets a foundation for tackling higher-dimensional matrix inversions and linear algebra at large.
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