Question

Intro. problem for Heaviside cover up

Answer 1

http://i.imgur.com/q69NYyv.png

Answer 2

Problem: Decompose 1/(x^3-x) into partial fractions

Solution: I factored the bottom into x(x-1)(x+1)

For the first term in the denominator I have A/x. Covering up x does x=0? If so then A=0 but the answer says A is equal to -1