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Expert-verifiedFound in: Page 93

Book edition
5th

Author(s)
David C. Lay, Steven R. Lay and Judi J. McDonald

Pages
483 pages

ISBN
978-03219822384

**If a matrix \(A\) is \({\bf{5}} \times {\bf{3}}\) and the product \(AB\)is \({\bf{5}} \times {\bf{7}}\), what is the size of \(B\)?**

\(3 \times 7\)

Since the matrix \(A\) has three columns, the number of rows in the matrix \(B\) must be three.

The number of columns in matrix \(AB\) is seven, then the number of columns in matrix \(B\) is seven.

So, the size of matrix \(B\) is \(3 \times 7\).

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