Question

III. Answer the following questions
11. The length of a rectangle is (3x + 2) units and its breadth is (3x – 2) units. Find its
area interms of x. What will be the area if x = 20 units.​

Answer 1

Step-by-step explanation:

area of rectangle = l * b

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

= 9x^2 - 6x + 6x - 4

= 9x^2 - 4units.......eq.

put the value of x [ x = 20units ] in equation....

9*(20)^2 - 4 units

9 * 400 - 4 units

3600 - 4 units

3596 units

hope it helps

Answer 2

Answer:

3596 is ur answer. plzzzz mark my answer as brainliest........

explanation..

l=(3x+2)

b=(3x-2)

area of rectangle=l×b

by using...(a-b) (a+b)= (a)sq.minus (b) sq .

(3x+2)×(3x-2)=(3x)sq.× _ 2sq.

= 9x square _ 4

=9×20 square - 4

= 9× 400-4. = 3600-4 = 3596.