Question

Find the order of the difference equation yn+3 -3 yn+1 – yn-2 = 4.

(a) 3

(b) 4

(c) 5

(d) 6

The question was posed to me in a job interview.

My question is from Linear Difference Equations and Z in section Fourier Integral, Fourier Transforms and Integral Transforms of Engineering Mathematics

Answer 1

Correct choice is (c) 5

Explanation: The order of the given difference equation can be written as Order = \(\frac{n+3-n+2}{1}\). Therefore the order is 5.