MATSEC AM Pure Mathematics Complete Prep Course — Lesson 90: Inverse of a 2×2 matrix

Lesson ninety builds the two by two inverse as one over a d minus b c times the adjugate, the swap-and-negate matrix, and fixes the singular condition when that determinant is zero. It drills the identity check, the correct side for pre-multiplying and post-multiplying in matrix equations, the reversed-order rule for the inverse of a product, and verification that two given three by three matrices are inverses.

Lesson 90 of 158 in the MATSEC AM Pure Mathematics Complete Prep Course audio course from ExamPrepRise.

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