Quick questions on Matrix arithmetic and determinants: addition, multiplication and the 2x2 and 3x3 determinant - OCR A-Level Further Maths A

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Find

\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix} + 2\begin{pmatrix} 0 & 1 \\ -1 & 2 \end{pmatrix}

. [2 marks]

What is q2?

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Find the value of

k

for which

\begin{pmatrix} k & 3 \\ 2 & k \end{pmatrix}

is singular. [3 marks]

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