Question

se a=|2   1|, b= |-1   -2| calcule det (A+B):
        |-3   4|      |5     3|

Answer 1

DETERMINANTES

DtA+DtB= | 2  1 |  + |-1  -2 | => DtA+DtB= [2*4-(-3)*1] + [(-1)*3 - (-2)*5]
                |-3  4 |     | 5   3 |

DtA+DtB=(8+3) + (-3+10)
DtA+DtB=11+7
DtA+DtB=18

Answer 2

A
| 2 1 |
|-3 4 |

B
|-1 -2|
| 5 3 |

det (A + B) = [2*4 - (-3)*1] + [(-1)*3 - 5*(-2)]
det (A + B) = [8 + 3] + [- 3 + 10]
det (A + B) = 11 + 7 = 18