Question 74485
{{{(m^2 - 5mn + 3n^2)(m^2 + 4mn - 2n^2)}}}
This is in the form (a - b + c)(d + e - f) which
equals ad + ae - af - bd - be + bf + cd + ce - cf
{{{m^4 + 4m^3n - 2m^2n^2 - 5m^3n - 20m^2n^2 + 10mn^3 + 3m^2n^2 + 12mn^3 - 6n^4}}}
combine terms
{{{m^4 - m^3n - 19m^2n^2 + 22mn^3 - 6n^4}}} answer