Answer:
The length of the side of a square is 
Step-by-step explanation:
Area of square = 
We need to find length of the side
The formula used will be:

Putting value of area of square, we can find length

So, length of the side of a square is 
It's just a math equation.
Answer:
The answer is 4z^2 + 7z
Step-by-step explanation:
7z + 4z^2 +6 - 6
So, just combine like term which is 6 - 6 = 0
So, the remaining is 4z^2 + 7z that cannot be simplified anymore