By completing the square. what is the missing term required to form a square trinomial?

Missing term is 225/4

Step-by-step explanation:

First move +18 to the other side. Subtract 18 on both sides

In completing the square method we take the half of coefficient of x  and then square it

coefficient of x  is 15

Half of 15 is

Square it  

Missing term is 225/4 that is required to form a square trinomial

Add it on both sides

Now we write left hand side in square form

Now we solve for x

Take square root on both sides

Subtract 15/2 on both sides

because that’s us why