Final answer:
To find the approximate surface area of the concrete that will be stained, you need to find the sum of the surface areas of the driveway and the patio. The approximate surface area of the stained concrete would be x^2 + y^2.
Step-by-step explanation:
To find the surface area of the concrete that will be stained, we need to find the sum of the individual surface areas of the driveway and the patio. Since both the driveway and patio are square-shaped, the surface area of each can be found by multiplying the length of one side by itself.
Let's assume the side length of the square-shaped driveway is 'x' and the side length of the square-shaped patio is 'y'. Therefore, the surface area of the driveway is x * x = x^2 and the surface area of the patio is y * y = y^2. The approximate surface area of the stained concrete would be x^2 + y^2.