Sabendo - se a = ![\left[\begin{array}{ccc}-3&2\\-5&1\\\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-3%26amp%3B2%5C%5C-5%26amp%3B1%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}-3&2\\-5&1\\\end{array}\right]")
e b = ![\left[\begin{array}{ccc}2&6\\4&10\\\end{array}\right]](https://tex.z-dn.net/?f=++%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D2%26amp%3B6%5C%5C4%26amp%3B10%5C%5C%5Cend%7Barray%7D%5Cright%5D+ "\left[\begin{array}{ccc}2&6\\4&10\\\end{array}\right]")
, calcule o valor de 3a + 
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| 3.(-3) 3.(2) | + | 2² 6² |
| 3.(-5) 3.(1) | + | 4² 10²|
| -9 6 | + | 4 36 |
|-15 3 | + |16 100|
| -9 + 4 6 + 36 | = | - 5 42 |
|-15 +16 3+100| = | - 1 103 | OK
| 3.(-3) 3.(2) | + | 2² 6² |
| 3.(-5) 3.(1) | + | 4² 10²|
| -9 6 | + | 4 36 |
|-15 3 | + |16 100|
| -9 + 4 6 + 36 | = | - 5 42 |
|-15 +16 3+100| = | - 1 103 | OK
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