The z-transform of a function y(k) is: 2-0,4z +0,68z Y(2)=- (z-0,4)(z-1.2z+1) Perform partial fraction expansion (PFE) for inverse z- transformation to find y( k ) for k =0,1, 2, 3 ... (Hint: If one partial fraction has a second order polynomial in the denominator it must have a first order polynomial in the numerator)