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.
-2(x - 5) + 4(9 + x)
-2x + 10 + 36 + 4x
=2x + 46
Answer: 1.83
Step-by-step explanation:
Hope this helps!
area of rectangle = l×b
So, area of drawing = l×b = 8cm×4cm = 32cm²