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 + 2^x − 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.

Question

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 + 2^x − 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.

triciaal · Answer

the perimeter of the triangle is the sum of the 3 lengths

fabgirl1994 · Answer

No. I have to add all 3 together, it says in the first question what is the total length of both sides and the triangle. I'm just unsure how to add them together.

triciaal · Answer

what do you mean by no? 
the perimeter is always the sum of the lengths around a figure; in the case of a circle it is called the circumference.

triciaal · Answer

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