Quick questions on Matrices - AP Precalculus Unit 4

3short 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{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}\begin{bmatrix} 7 \\ -2 \end{bmatrix}

. [1 point]

What is q2?

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What size must

B

be for

A B

to be defined if

A

2 \times 3

? [1 point]

What are mismatched dimensions?

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AB

exists only when the columns of

A

equal the rows of

B

; check before multiplying.

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