(x^3+x^2-9x-6)÷(x^2-9) using long division? how would i solve?

Plz heeeeeeelp plz give me the answer

Axel follows these steps to divide 40 by 9: start with 40. 1. divide by 9 and write down the remainder. 2. write a zero after the remainder. 3. repeat steps 1 and 2 until you have a remainder of zero. examine his work, and then complete the statements below.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?