Exercise 24

Simplify each expression, if possible, by combining like terms.

  1. \({-5z+3z^{2}+2z^{2}-3z^{2}}\)

  2. \({-2z^{2}-9+3y^{2}+9z^{2}}\)

  3. \({-9s-8z}\)

  4. \({7z^{2}+y^{2}}\)

in-context