# how to factorize an expression with constant variables ?

Hello, I would like to factorize an expression with sage that contains constant variables (i.e. parameters), but I cannot figure out how to do that.

Here is an example : `x`

, `y`

are variables and `A`

is a parameter

```
var('A x y')
f = A*x + x + A^2*exp(y) + y
print (f.factor())
```

Sage returns `A^2*e^y + A*x + x + y`

.
Instead, I would like that sage returns `(A+1)*x + (A^2+1)*exp(y)`

.

How to do that ? Thank you