Help me with this, I’ve been stuck in it for a long time

See the explanation below please :)

Step-by-step explanation:

a. There is always one spuare on both the top right and bottom left corner, but the number of squares in the center part is always (For example: first: =1, second: = 4, third: = 9, etc.)

b. It is quadratic since the total number of squares in each figure equals +2

c. Sub n=1, n=2, n=3, n=4 into +2 and prove the pattern fits