1 | initial version |

You should work with polynomials, not symbolic expressions.

Here is an example, let us assume that your matrix is defined over the field `QQ`

:

```
sage: A = random_matrix(QQ,3)
sage: A
[ 2 0 -2]
[ 2 2 0]
[-1/2 0 0]
```

Then you can define the polynomial ring with one variable over the rationals, and define your polynomial:

```
sage: R.<x> = PolynomialRing(QQ)
sage: R
Univariate Polynomial Ring in x over Rational Field
sage: f = 2*x^2 + x + 3
sage: f.parent()
Univariate Polynomial Ring in x over Rational Field
```

And apply it to your matrix:

```
sage: f(A)
[ 15 0 -10]
[ 18 13 -8]
[-5/2 0 5]
```

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