(1/2y+2)**4

(1/2у + 2)**4 = (1/2у + 2)(1/2у + 2)(1/2у + 2)(1/2у + 2) = (1/4у^2 + 2у + 2у + 4)(1/2у + 2) = (1/4у^2 + 4y + 4)(1/2у + 2) = 1/8у^3 + 4у^2 + 4у + 2у^2 + 8y + 8 = 1/8у^3 + 6y^2 + 4у + 8y + 8