The lengths of two sides of a triangle are shown below: side 1: 8x2 − 5x − 2 side 2: 7x − x2 + 3 the perimeter of the triangle is 4x3 − 3x2 + 2x − 6. part a: what is the total length of the two sides, 1 and 2, of the triangle? (4 points) part b: what is the length of the third side of the triangle? (4 points) part c: do the answers for part a and part b show that the polynomials are closed under addition and subtraction? justify your answer. (2 points)