A square plot of land will be fully used for a square swimming pool with a 5 foot wide walkway around it. The area of the entire plot, including the walkway, is A square feet. Which expression gives the length of the pool?

The expression that gives the length of the pool is - 5

Step-by-step explanation:

Assume that the length of the pool is x feet

∵ The length of the pool is x feet

∵ The wide of the walkway around the pool is 5 feet

∴ The total length of the pool with the walkway = (x + 5) feet

∵ The area of the entire plot, including the walkway, is A square feet

∴ The area of the entire plot, including the walkway = A feet²

∵ The area of the square = (length)²

→ Substitute the length by (x + 5)

∴ The area of the entire plot, including the walkway = (x + 5)² feet²

→ Equate it by A

∴ A = (x + 5)²

→ To find x take square root for both sides

∵ =

→ Cancel the square root of the right side by power 2

∴ = x + 5

→ Subtract 5 from both sides

∵ - 5 = x + 5 - 5

∴   - 5 = x

→ x represents the length of the pool

∴ The length of the pool is   - 5 feet

∴ The expression that gives the length of the pool is - 5

final answer is : )