Need some help with this matrices question
1 answer:
Answer:
4. D
5. D
Step-by-step explanation:
To subtract Matrices, subtract the numbers that are in the same position.
You can only add or subtract Matrices that have the same order.
Here, both Matrix X and Y, are 2 by 2 matrices.
So let's subtract
The Matrix that matches that is D so the answer to 4 is D.
5. We do the same thing above, but we multiply by 2 first.
The answer here is D as well.
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Given equation is
It can be written as follows.
Which is of the form
where a=3 and b=4.
We know that the coordinates of the vertices are (a,0) and (-a,0)
Substitute a=3, we get
The vertices are (3,0) and (-3,0).
We know that the coordinates of the foci are (c,0) and (-c,0)
Substitute a=3 and b=4, we get
Substitute c=5, we get
Hence the foci are (5,0) and (-5,0).