What is the first backward difference of y(n)?
A. [y(n)+y(n-1)]/T
B. [y(n)+y(n+1)]/T
C. [y(n)-y(n+1)]/T
D. [y(n)-y(n-1)]/T
Answer:A
What is the first backward difference of y(n)?
A. [y(n)+y(n-1)]/T B. [y(n)+y(n+1)]/T C. [y(n)-y(n+1)]/T D. [y(n)-y(n-1)]/T
Explanation: A simple approximation to the first order derivative is given by the first backward difference. The first backward difference is defined by