1. 1/a^8 (Sorry I can't find out what the others are)
Answer:

Step-by-step explanation:
we are given equation as

Since, we have to solve it by using complete square
so, firstly we will complete square
and then we can solve for x
step-1:
Factor 2 from both sides

step-2:
Simplify it

step-3:
Add both sides 3^2

now, we can complete square

step-4:
Take sqrt both sides

step-5:
Add both sides by 3
we get

Answer:
A, 120.
Step-by-step explanation:
x-15+75=180
x+60=180
x=120.