Answer:
10x+25
Explanation:
The area of the large square is
A= s^2 where s is the side length
A =(x+5)^2
FOIL
x^2 +10x +25
The small square has an area of
A =(x)^2
The difference is
A large minus A small
x^2 +10x +25 - x^2
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