A matrix is diagonal if
In other words, you want non-zero elements only when the indices of the row and the column are the same: the first element of the first row must be non zero, the second element of the second row must be non-zero, and so on. All other elements must be zero.
ANSWER
When 
is written in the form 
, it looks like 
EXPLANATION
To write in the form , we have to complete the squares.
We add and subtract half the coefficient of 
square.
The first three terms of the function is now a perfect square.
We now simplify rto obtain,
Answer:
Step-by-step explanation:
Use Photomath math it’s really good download it
Answer:
$27.00
Step-by-step explanation:
First, 10% of 30 = 3.
Second, 30 - 3 = 27
Hope this helps!
