i need ONLY number 7 my teacher gave me this packet and i can’t figure that one out

Answer:
(3x+6)^2
Step-by-step explanation:
the side of the inner square is 3x long
to have the wider square side we must add 3 two times, so 3x + 3 + 3 = 3x+6
to find the area we must square it (3x+6)^2