If A = [[3, 5], [1, 4]], B = [[2, 4], [0, 3]] and C = [[1, -1], [2, 1]], then 5A - BC is equal to:

Topic: Matrices

Previous-year question practice database

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[[-5, -23], [1, 17]][[5, 23], [1, 17]][[-2, 8], [-3, 3]][[5, 23], [-1, 17]]

Exam answer

(d) [[5, 23], [−1, 17]]

Explanation

First calculate BC, then subtract it from 5A. The resulting matrix is [[5, 23], [−1, 17]].

In words

[[5, 23], [−1, 17]]