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)

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

Answer 1

Part A;

Side 1: 8x^2-5x-2

Side 2: 7x-x^2+3
_______________________
Total length = 7x^2 +2x +1

Answer 2

I did part a and b I just need a little help with part c

Answer 3

Length of the third side = perimeret of the triangle - total length of the two sides
= 4x^3-3x^2+2x-6 - (7x^2 +2x +1)
= 4x^3-3x^2+2x-6 - 7x^2 -2x -1
Length of the third side = 4x^3- 10x^2 -7

@bangbang559

Answer 4

@bangbang559 Medal please

Answer 5

I already posted the answer for part a and b in my my question, soooo I don't know why you answered them again. I said I just need help with part c

Answer 6

@dpasingh

Answer 7

if you can help me with part c like I asked then I can give you a medal

Answer 8

http://answers.yahoo.com/question/index?qid=20130102074825AAI2BwV