Mathematics, 18.02.2021 20:00 polo1397

The lengths of two sides of a triangle are shown below: Side 1: 3x2 - 4x - 1
Side 2: 4x - x?.5
The perimeter of the triangle is 5x3 - 2x² + 3x - 8.
Part A: What is the total length of the two sides, 1 and 2 of the triangle? (4 points)
Part 8: 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.

help ASAP

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The lengths of two sides of a triangle are shown below: Side 1: 3x2 - 4x - 1
Side 2: 4x - x?....