What is the product? 2 times the 2 by 1 column matrix row 1 negative 1 row 2 0

To multiply a matrix by 2, multiply each entry by 2. Thus 2 times the column matrix with entries −1 and 0 gives entries 2(−1) = −2 and 2(0) = 0. The result is the column matrix with −2 above 0, choice B.

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