Question

NEED ANSWER ASAP !!!

Answer 1

Answer:

$D = \left[\begin{array}{ccc}9&11\\-14&5\end{array}\right]$

Step-by-step explanation:

To add two matrices you just need to add the corresponding entries together. In this case, we have that:

$D + \left[\begin{array}{ccc}-1&-15\\0&7\end{array}\right] = \left[\begin{array}{ccc}8&-4\\-14&-12\end{array}\right].$

Solving for D:

$D = \left[\begin{array}{ccc}8&-4\\-14&12\end{array}\right] - \left[\begin{array}{ccc}-1&-15\\-0&7\end{array}\right] = \left[\begin{array}{ccc}9&11\\-14&5\end{array}\right]$

Then, the solution is the fourth option.

$D=\left[\begin{array}{ccc}9&11\\-14&5\end{array}\right]$

Answer 2

Answer:

The correct is last option

Step-by-step explanation:

It is given that

D +  | -1   -15 |   =   |  8   -4  |

       | 0     7   |        |-14  12 |

To find the value of D

We can write ,

D = |  8   -4  |   -    | -1   -15 |

      |-14  12 |        | 0     7   |  

D = | (8 - -1)   (-4 - -15)  |  

      |(-14 - 0)   (12 - 7)   |    

 

D = | (8 +1)   (-4 +15)  |  

      |(-14)      (12 - 7)   |    

D = | 9   11  |  

      |-14   5 |  

Therefore the correct answer is last option