The figure given is a rectangle
The larger rectangle is the outer rectangle while the inner rectangle is the smallest rectangle.
The area of a rectangle is given as
Area = Length x width
Length of the outer rectangle = 3x + 2
The width of the outer rectangle = 4x
The length of the inner rectangle = 2x
The width of the inner rectangle = 3x
The area of the shaded region = Area of the larger rectangle - area of the smaller rectangle
For the larger rectangle
Area = length x width
Area = (3x + 2) x 4x
Open the parenthesis
Area = 4x * 3x + 4x * 2