The lengths of two sides of a triangle are shown below:
Side 1: 8x^2 - 5x - 2
Side 2: 7x - x^2 + 3
The perimeter of the triangle is 4x^3 - 3x^2 + 2x - 6
Answer the following questions:
Part A: What is the total length of the two sides, 1 and 2, of the triangle?
Part B: What is the length of the third side of the triangle?
Part C: Do the answers for Part A and Part B show that the polynomials are closed under addition and subtraction? Justify your answer.
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