medal and fan for the first answer:

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

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)

Question

medal and fan for the first answer:

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

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)

anonymous · Answer

part a:7x^2+2x+1
part b:4x^3-10x^2-5

whpalmer4 · Answer

part b appears to be slightly off..

anonymous · Answer

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you might have missed something out :3