I dont want answers i want a explanation on how you do this like how did they get 2/10 on the second one?

Step-by-step explanation:

There are  100 small squares in each large square .

On the first row we count 11 dark squares so the fraction of these is 11/20.

You then convert  11/20 to a decimal , percent and words ( 11 pieces out of 100

pieces)

For the second  part we  color in 20 small squares of the big square. ( 2/10 = 20/100).

Third row:  I think it must be 80 pieces out of 100 :- color in 80. Fraction = 80/100 = 4/5.

For the last one color in all hundred squares on first big square and 50 on the second.

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square