# Revision history [back]

Thanks for the report. Looks like a terrible bug! It was introduced in SageMath 8.4: it is already there, while in SageMath 8.3, we get a mathematically correct result:

sage: factor(exp(-x)+2*exp(x))
(2*e^(2*x) + 1)*e^(-x)


Thanks for the report. Looks like a terrible bug! It was introduced in SageMath 8.4: it is already there, while in SageMath 8.3, we get a mathematically correct result:

sage: factor(exp(-x)+2*exp(x))
(2*e^(2*x) + 1)*e^(-x)


I've opened the Trac ticket #27304 for it.