Question

The perimeter of a triangle is 14x2 + 20x +13.

Two of its sides are 3x2 + 5x+1 and x

2 + 10x-6. Find its third side.​

Answer 1

Answer:

11x² + 14x + 12

Step-by-step explanation:

Given,

Perimeter ( Triangle ) = 14x² + 20x + 13

Two sides

3x² + 5x + 1

and x

To find : 3rd side = ?

Let the 3rd side be a.

Formula : -

Perimeter ( Triangle ) = Sum of all sides

14x² + 20x + 13 = 3x² + 5x + 1 + x + a

14x² + 20x + 13 - 3x² - 5x - 1 - x = a

14x² - 3x² + 20x - 5x - x + 13 - 1 = a

11x² + 14x + 12 = a

The 3rd side is 11x² + 14x + 12.