\(5 r^{2} + 6 r + 9 + (-3 r^{2} -8 r + 5)\)
Operations with Polynomials
Add and subtract quadratic expressions
Simplify each of the following expressions.
Understand that polynomials form a system analogous to the integers, namely, they are closed under the operations of addition, subtraction, and multiplication; add, subtract, and multiply polynomials.