Identify Like Terms: Identify the like terms in both polynomials.(7s2+8s+3)+(9s+3) can be rearranged as (7s2)+(8s+9s)+(3+3).
Combine Like Terms: Combine the like terms.7s2 remains unchanged as there are no other s2 terms.8s+9s=17s since they are like terms.3+3=6 since they are constant terms.
Write Final Expression: Write the final expression after combining like terms.The sum of the polynomials is 7s2+17s+6.