Question

Calculate the perimeter of a rectangle whose area is 25x2 – 35x + 12. ​

Answer 1

Answer:

20x-14 is perimeter

Step-by-step explanation:

Area :

= 25x²-35x+12

= 25x²-20x-15x+12

= 5x(5x-4)-3(5x-4)

= (5x-4)(5x-3)

Hence, Length = (5x-4) and Breadth = (5x-3)

Perimeter = 2(L+B) = 2(5x-4+5x-3) = 2(10x-7) = 20x-14

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Answer 2

Answer:

Area of rectangle = 25x2 – 35x + 12

We know, area of rectangle = length × breadth

So, by factoring 25x2 – 35x + 12, the length and breadth can be obtained.

25x2 – 35x + 12 = 25x2 – 15x – 20x + 12

=> 25x2 – 35x + 12 = 5x(5x – 3) – 4(5x – 3)

=> 25x2 – 35x + 12 = (5x – 3)(5x – 4)

So, the length and breadth are (5x – 3)(5x – 4).

Now, perimeter = 2(length + breadth)

So, perimeter of the rectangle = 2[(5x – 3)+(5x – 4)]

= 2(5x – 3 + 5x – 4) = 2(10x – 7) = 20x – 14

So, the perimeter = 20x – 14