SOLUTION
The square feet of tile needed is the area fo the shape given
Consider the image below
The area of the shape is the sum of the individual arear of the of the two Rectangle and the Area of the square

Then

Since the other rectangle at the base have the same dimension, The are is

Then, we obtain the Area of the Square

Hence, the area of the Shape is

The Square feet tile that will be used is 64 square feet