Explanation:
The area A of a rectangle is given by multiplying its length and width. In this case, the length is 7x - 1 units and the width is 2x + 3 units. Therefore, the area of the rectangle is:
A = (7x - 1)(2x + 3)
= 14x^2 + 19x - 3
Hence, the area of the rectangle is 14x^2 + 19x - 3 square units.