Question

7.
The length of a rectangle is 3x² +5x-1 and its width is 3x + 1. Find its
perimeter.

Answer 1

Answer:

Answer of this question is 3596units^2

Step-by-step explanation:

The length of rectangle, L = ( 3x + 2 ) units

And breadth, B = ( 3x – 2 ) units

As we know,

Area of rectangle = length × breadth

= ( 3x + 2 ) × ( 3x – 2 )

= ( 3x )² – ( 2 )²

= 9x² – 4

Given that, x = 20

substituting x = 20 in the above equation :

= 9( 20 )² – 4

= 9 ( 400 ) – 4

= 3600 – 4

= 3596 units²

Hence, the area of rectangle is 3596 units² .

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