Question

A rectangle is (3b-5) cm long and (7b + 4)
cm broad. Find its area.

Answer 1

Here we are given the length and breadth of a rectangle.

Length = 3b - 5

breadth = 7b + 4

We have to find the area of the rectangle

Area of rectangle = length × breadth

                             = (3b - 5) × (7b + 4)

                             = 21b² + 12b - 35b - 20

                            = 21b² - 23b - 20

Hence, the area of the rectangle will be 21b² - 23b - 20 square units.