Problem:
Multiply and expand $p(x) = -9 x^2+5 x+13$ and $q(x) = -13 x^2-x-5$
Answer:
$117 x^4-56 x^3-129 x^2-38 x-65$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/multiply_polynomials/21031.txt'}