Final answer:
To find the length of side AB in terms of x, we can set up an equation using the formula for the area of a rectangle. However, without more information about the length of the other side, we cannot determine the length of side AB.
Step-by-step explanation:
To find the length of side AB in terms of x, we need to use the formula for the area of a rectangle which is length times width.
The area of rectangle ABAD is given as 28 cm2. Let the length of side AB be x. Since the area is equal to length times width, we can say that x times the width AD is equal to 28 cm2. In other words, x times AD = 28.
To find x, we need to know the value of AD. Without any additional information in the question, we cannot determine the length of side AB in terms of x.