The length of the rectangle is 8cm and the width is x cm less. Write the perimeter of this rectangle as an expression.

1) Let’s write an expression for determining the width of the rectangle:

(8 + x) cm.

2) The perimeter of a rectangle (P) is equal to the sum of the lengths of all its sides. In a rectangle, the opposite sides are pairwise equal, therefore:

P = a + a + b + b = 2a + 2b, where a is the length, b is the width of the rectangle.

The expression for finding the perimeter of a given rectangle will look like this:

P = 2 * 8 + 2 * (8 + x);

P = 16 + 16 + 2x;

P = 32 + 2x.