Question

The length of a rectangle is (3x + 2) units and it’s breadth is (3x – 2) units. Find its area in terms of x. What will be the area if x = 20 units

Answer 1

Length of the rectangle = 3x + 2 units

Breadth of the rectangle = 3x – 2 units

Area of the rectangle = (3x + 2) (3x – 2)

= 9x² – 6x + 6x – 4

= 9x² – 4

When x = 20

Area of the rectangle = 9(20)² – 4

= 9(400) – 4

= 3600 – 4

= 3596 sq.units.