4. Matrix Algebra

Matrix Addition And Scalar Multiplication — Quiz

Test your understanding of matrix addition and scalar multiplication with 5 practice questions.

Practice Questions

Question 1

When is the sum of two matrices defined?

Question 2

What is $\begin{bmatrix}1 & 2 \\ 3 & 4\end{bmatrix} + \begin{bmatrix}5 & 6 \\ 7 & 8\end{bmatrix}$?

Question 3

What is $3\begin{bmatrix}1 & -2 \\ 0 & 3\end{bmatrix}$?

Question 4

If $A$ is a $3\times 2$ matrix, what is the size of $-7A$?

Question 5

If $A=\begin{bmatrix}2 & 1 \\ -1 & 3\end{bmatrix}$ and $B=\begin{bmatrix}0 & 4 \\ 5 & -2\end{bmatrix}$, what is $2A+B$?