Question

The area of a square playground (in square feet) can be represented by x2 - 30x + 225. How many feet is the perimeter of the playground if x = 25?

Answer 1

40

Explanation:

Substitute 25 for x

`{25}^(2) - 30(25) + 225 = 100`

100 is the area of the square so that means

10 is the side length of each side of the square.

Multiply 4 by 10 to get the perimeter.

`4 * 10 = 40`