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The inverse of A = \pmatrix{ a & b \cr c & d} is A^{-1} = \displaystyle \frac{1}{ad-bc} \pmatrix{ d & -b \cr -c & a }
Remember that in general AB \ne BA

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## Glossary

### union

The union of two sets A and B is the set containing all the elements of A and B.

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## This question appears in the following syllabi:

SyllabusModuleSectionTopicExam Year
AQA A-Level (UK - Pre-2017)FP4Matrix algebraThe basics-
CCEA A-Level (NI)FP1Matrix algebraThe basics-
Edexcel A-Level (UK - Pre-2017)FP1Matrix algebraThe basics-
OCR A-Level (UK - Pre-2017)FP1Matrix algebraThe basics-
OCR-MEI A-Level (UK - Pre-2017)FP1Matrix algebraThe basics-
WJEC A-Level (Wales)FP1Matrix algebraThe basics-
Methods (UK)M5Matrix algebraThe basics-
Pre-Calculus (US)E2Matrix algebraThe basics-