Further MathematicsMatrices and determinantsWAEC
The inverse of the matrix with rows (2, 1) and (5, 3) is the matrix with rows
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Answer: C. (3, −1) and (−5, 2)
Determinant = 6 − 5 = 1; swap the leading diagonal and change the signs of the others.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.