Please help I don’t have much time

Second answer choice

Step-by-step explanation:

Good luck

6/y8

Step-by-step explanation:

We are given the sides of the triangle equal to   8x^2 - 5x - 2 and 7x - x^2 + 3. the sum of the two lengths is just the total of the terms given. the sum is equal to 7x^2 + 12x + 1. the perimeter is the sum of all three sides, hence the third side is 4x^3 - 3x^2 + 2x - 6 - (7x^2 + 12x + 1) equal to 4x^3 -10x^2 -10x -7. the operations used are just subtraction and addition.