Question

Which matrix is equal to 3A?

A=[41395]

Responses

[716128]

matrix with 2 rows and 2 columns. row 1 column 1 entry 7. row 1 column 2 entry 12. row 2 column 1 entry 16. row 2 column 2 entry 8

[12 13 95]

matrix with 2 rows and 2 columns. row 1 column 1 entry 12. row 1 column 2 entry 9. row 2 column 1 entry 13. row 2 column 2 entry 5

[110 6 2]

matrix with 2 rows and 2 columns. row 1 column 1 entry 1. row 1 column 2 entry 6. row 2 column 1 entry 10. row 2 column 2 entry 2

[12392715]

matrix with 2 rows and 2 columns. row 1 column 1 entry 12. row 1 column 2 entry 27. row 2 column 1 entry 39. row 2 column 2 entry 15

Answer 1

A = [[4, 13],
[9, 5]]

3A = [[3·4, 3·13],
[3·9, 3·5]]
= [[12, 39],
[27, 15]]

So the correct choice is the one showing [12 39; 27 15] (the fourth option).