How do I compute impulse response?

How can I calculate the impulse response for the following equation:

y[n]=-5*X[n]+2*X[n-1]-5*X[n-2]+2*X[n-3]

Answer 1

[Andrei Bobrov]

You can use the filter function with the coefficients as an input argument.

[mustafa mutlu]

thank you for your contribution