Answer:
I guess 21 is your answers.
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;

[
]
Simplify:

The number must be added to complete the square is, 
Answer:
Either,
, -0.75, or 4x = -3!
Step-by-step explanation:
Answer:
4,9
Step-by-step explanation:
i looked it up on a website,uhhhhh i don't know if its completely write soooo.....