Define the length and the width of the rectangle
length = 5x + 4
width = 3x + 2
Determine the area
area = length × width
area = (5x + 4) (3x + 2)
area = (5x)(3x) + 2(5x) + 4(3x) + (4)(2)
area = 15x² + 10x + 12x + 8
area = 15x² + 22x + 8
The area of the rectangle is (15x² + 22x + 8) units²