Brainlies asap! the lengths of two sides of a triangle are shown below: side 1: 3x^2 − 4x − 1 side 2: 4x − x^2 + 5 the perimeter of the triangle is 5x^3 − 2x^2 + 3x − 8. 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)