Question

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

Answer 1

Since area of rectangle= L×B
Therefore,
=(3x+2) (3x-2)
using identity
= (3x)^2 -(2)^2
= 9x^2 - 4 sq. units

If x = 20
= 9(20)^2 -4
=3600 - 4
= 3596 sq. units

Answer 2

hey there!!

area of a rectangle = lenght times breadth

= ( 3x + 2 ) ( 3x - 2 )

= ( a + b ) ( a - b )

= a^2 - b^2

= 9x^2 - 4

= x = 20

= 3600 - 4

= 3596

hope my answer helps!