To complete the square means that by adding or subtracting a constant to the equation, we have to take the left side of the equation to the form:

Now, notice that:

Adding 81=9² to the equation we get:

Therefore, we can rewrite the given equation as:

Then:
![x-9=\pm\sqrt[]{146}.](https://img.qammunity.org/2023/formulas/mathematics/college/dfh8unkzofq8zd51gnhhsdkf4rxrr0mdnx.png)
Finally, we get that:
![x=9\pm\sqrt[]{146}.](https://img.qammunity.org/2023/formulas/mathematics/college/r312cnc2xnhkst4ngjtojb4qg2o4h0kb3u.png)
Answer:
