What is the area of a rectangle, one of the sides of which is x cm. And the other is 3 cm larger?

Given:
Rectangle.
Width – x cm (by condition).
Length – x + 3 cm (as by condition, more than the width by 3 cm).
Find: area -? cm².
Area is the product of the length and width of a polygon. In this case, a rectangle.
Formula: S = a * b.
a – length (x cm).
b – width (x + 3 cm).
We get:
S = x * (x + 3) = x² + 3x cm² – the area of this rectangle.
Answer: x² + 3x cm².