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Matrices · Question 17 of 106

Question 17

EasyOriginal question

Which of the following is a scalar matrix?

\begin{bmatrix}3 & 0 \\ 0 & 3\end{bmatrix}

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\begin{bmatrix}3 & 0 \\ 0 & 2\end{bmatrix}

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\begin{bmatrix}0 & 3 \\ 3 & 0\end{bmatrix}

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\begin{bmatrix}3 & 3 \\ 3 & 3\end{bmatrix}

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Show the answer and explanation

CorrectNot quiteAnswer A

Correct answer: A

A scalar matrix is a diagonal matrix with every diagonal element equal.
Only $\begin{bmatrix}3 & 0 \\ 0 & 3\end{bmatrix}$ fits.

Concept: Scalar matrices
Typical timeTypical: 60 s
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