Question 166051
{{{(4-5y+y^3)-(2-3y+y^2)}}}
={{{4-5y+y^3-2+3y-y^2}}}   remove parentheses
={{{4-2-5y+3y-y^2+y^3}}}   grouping like terms
={{{2-2y-y^2+y^3}}}        combine like terms