Question 158453
{{{(4-5y+y^3)-(2-3y+y^2)}}}
={{{4-5y+y^3-2+3y-y^2}}}   (remove the parentheses)
={{{y^3-y^2-5y+3y+4-2}}}
={{{y^3-y^2-2y+2}}}   (combine like terms)