Answer:
Given equation: 
when we complete the square , we take half of the value of 8 , then square it, and added to the left sides, we get;

∵8 is the value 
Notice that, we add this both sides so that it maintains the equality.
then;

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Simplify:

The number must be added to complete the square is, 
170 and 60 is the answer is that want you are asking for
Answer:
70
Step-by-step explanation:
i added 30% and 40
I don’t really understand the question so I just did 4 ways of this. Hope this help