#(y + 2.47595271)(y^2 - 1.47595271 y + 5.6543891)#

Explanation:

#"There are no rational roots."# #"There is no easy factorization as such."# #"The cubic equation has 1 real root that can be factored out."# #"That root is "y = -2.47595271.# #"So the factorization is : "# #(y + 2.47595271)(y^2 - 1.47595271 y + 5.6543891)# #"This can be found by a general method to solve cubic equa-"# #"tions like Cardano's method or the substitution of Vieta."#