Matrices Test (for an accuracy grade)

Front

What does |A| represent for a matrix A?

Back

|A| represents the determinant of matrix A.

Front

How many columns are in a 5 x 4 matrix?

Back

A 5 x 4 matrix has 4 columns.

Front

What is an identity matrix?

Back

An identity matrix is a square matrix with 1s on the diagonal and 0s elsewhere.

Front

When using Cramer's Rule, what matrix do you find the determinant of when solving for y?

Back

You find the determinant of the matrix formed by replacing the y-column with the constants.

Front

Which sums can NOT be made from the following matrices: A, B, C, D?

Back

A + C cannot be made if A and C are not of the same dimensions.

Front

Define a matrix.

Back

A matrix is a rectangular array of numbers arranged in rows and columns.

Front

What is the determinant of a 2x2 matrix @@\begin{pmatrix} a & b \\ c & d \end{pmatrix}?

Back

The determinant is calculated as ad - bc.