<em>Use the Product Rule: x^a x^b = x^a + b</em>
5m^3 + 1 n^2 - 7m^2n + n + mn^2 - n^3 - (mn^2 + 2m^3)
<em>Simplify 3 + 1 to 4</em>
5m^4 n^2 - 7m^2n + n + mn^2 - n^3 (mn^2 + 2m^3)
<em>Simplify brackets </em>
5m^4 n^2 - 7m^2n + n + mn^2 - n^3 - mn^2 - 2m^3
<em>Collect like terms</em>
5m^4 n^2 - 7m^2n + n + n + (mn^2 - mn^2) - n^3 - 2m^3
<em>Simplify </em>
<u>5m^4n^2 - 7m^2n + n - n^3 - 2m^3</u>
