Respuesta :

Answer:

3rd side = 6x + 3

Step-by-step explanation:

The perimeter must be the given trinomial

The 3rd side = Perimeter - sum of the two given sides.

side 1 = 4x^2 + 2x

side 2 = 3x^2 + 6

Sum = 7x^2 + 2x + 6

3rd side = Perimeter - sum

3rd side = 7x^2 + 8x + 9 - (7x^2 + 2x + 6)        Remove the brackets

3rd side = 7x^2 + 8x + 9 - 7x^2 - 2x - 6

3rd side = 6x + 3

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