Answer:
x²+8x+16
Step-by-step explanation:
So it is a square with a side of x+4 as it is written in the question.
You calculate the area by (x+4)(x+4)
That is x²+8x+16
The picture is just for a visual representation. If you wouldn't want to multiply as I showed above, you would just add like terms.
x²+4x+4x+16
x²+8x+16
I hope I helped you. I will be happy If you mark my answer as brainliest.
