Question

I will Mark brain list
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Answer 1

Perimeter of Rectangle formula = 2(l+b)

(Note: b= breadth, which is the same as width, we just call it breadth where I study)

Given:

l = 3x² + 5x + 1

b = 3x + 1

So,

2(l + b)

2(3x² + 5x + 1 + 3x + 1)

2(3x² + 5x + 3x + 1 + 1)

2(3x² + 8x + 2)

6x² + 16x + 4

So, the perimeter of the rectangle will be 6x² + 16x + 4