Question 152991
First remove the parentheses.
Next combine like terms.
{{{(4x^3+x^2-3)-(-9x^3+5x^2-5)}}}
={{{4x^3 + x^2-3+9x^3-5x^2+5}}}
={{{4x^3+9x^3+x^2-5x^2-3+5}}}
={{{13x^3-4x^2+2}}}