Math Help - Adding and Subtracting Polynomials?

Perform each of the operations below and put your answers in descending order with regard to the x variable? I don't understand the question. Solve then put the answers in descending order?

2. ??

3. Originally Posted by pickslides
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Sorry, like for example:

$(12x^2y^2z^3+2+24x^2)-(-2x^2y^2z^3+24x^3+24x^2)$

4. You need to expand the brackets and then group like terms.

$(12x^2y^2z^3+2+24x^2)-(-2x^2y^2z^3+24x^3+24x^2)$

$12x^2y^2z^3+2+24x^2+2x^2y^2z^3-24x^3-24x^2$

$14x^2y^2z^3+2-24x^3$

In decending order of x

$-24x^3+14x^2y^2z^3+2$