What is the area of a rectangle with one side equal to X cm and the other 3 cm larger?

According to the general rule in mathematics, the area of a rectangle is the product of its sides. Taking into account the above, for the case considered in the initial task, we obtain:

1) Let us express the length of the second side of the rectangle, taking into account the initial data. In this case, the length of the second side will be denoted as b:

b = x – 3.

2) S = x * (x – 3);

S = x ^ 2 – 3 * x.