Area of rectangle whose sides are (2x - 7) and (2x + 7) is

2x2 - 49 square unit 2x2 - 7 square unit 4x2 + 49 square unit 4x2 - 49 square unit

4x2 - 49 square unit

Area of rectangle = length × breadth                             = (2x - 7) × (2x + 7)                             = (2x)2 - (7)2                  [(a + b)(a - b) = a2 - b2]                             = 4x2 - 49 square unit