ALGEBRA 1 HW!! PLEASE HELP I WILL GIVE BRAINLYEST! also pls explain how u got your answer

Answer:
a. b is the width of the largest square if you look the sides match.
b. The area is b² because b*b is b²
c. a²+2ab+b² is the entire area.
d. above the actual c is the top right is a² the top right and bottom left is ab and the largest is b²
e. they must have the same equations.
Step-by-step explanation: