Question

The length of a rectangle is (x - 9) feet. Its width is x feet. Write an expression you could use to find the perimeter

Answer 1

The expression for the perimeter of the rectangle is:
`P = 4x - 18`

Explanation:

Perimeter of a rectangle:

A rectangle has length l and width w. It's perimeter is given by:

`P = 2(l + w)`

In this question:

`l = x - 9, w = x`

So

`P = 2(x - 9 + x) = 2(2x - 9) = 4x - 18`

The expression for the perimeter of the rectangle is:
`P = 4x - 18`