Solve the Problem

question 28

Essay

Solve the problem.
- $\text { Let } \mathrm { A } = \left[ \begin{array} { l } - 2 \\1 \\- 1\end{array} \right] \text { and } \mathrm { B } = \left[ \begin{array} { l l l } 1 & - 1 & 0\end{array} \right] \text {. Find } \mathrm { AB } \text {. }$

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Definitions:

Combo Box Content Control

A control element in user interfaces that combines a dropdown list with an editable text box, allowing users both to select a predefined option or enter custom input.

Drop-Down List

A graphical control element that allows the user to choose one value from a list of values by clicking on it, often used in forms and spreadsheets.

Option Button

A graphical user interface element that allows the user to make a single choice among a group of options; also known as a radio button.

Repeating Section Content Control

A feature in document or form creation tools that allows users to duplicate a specific section as needed, maintaining consistent layout and formatting.