Question

The lengths of two sides of a triangle are shown below:

Side 1: 3x2 - 2x - 1

Side 2: 9x + 2x2 - 3

The perimeter of the triangle is 5x3 + 4x2 - x - 3.

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 1

@lacrosseplayer22

Answer 2

at least have the decency to try and solve your own problem

Answer 3

What are you talkin about?

Answer 4

I've already completed part A. I got 15x^5-2x-4. If that is correct can somebody help me?

Answer 5

@M,aliha @SithsAndGiggles @lacrosseplayer22

Answer 6

what kind of triangle is it

Answer 7

@BassCatcher15

Answer 8

It doesn't say. All the information I have is posted. Sorry!

Answer 9

so I think you have to add up side 1 and 2. then take the perimeter and subtract it from the sum of sides one and 2

Answer 10

@BassCatcher15 the length od the two sides would be the sum of the 2 sides

Answer 11

I know. But is my answer for that correct? I got 15x^5-2x-4.

Answer 12

for what?

Answer 13

the length of the two given sides.

Answer 14

the length of the two sides/sum is 5x^2+7x-4

Answer 15

So (5x^3 + 4x^2 - x - 3)-(5x^2+7x-4) equals what?

Answer 16

I think it is 5x^3-x^2-8x+1

Answer 17

did you get that?

Answer 18

Thats what I got too but it didnt look right to me at first.

Answer 19

Now how do I figure out Pt. C?

Answer 20

Somebody please help. Ive spent 5 hours on this damn exam and its only 5 questions long.

Answer 21

yes, it is closed, because it would not be a triangle if it was open.

Answer 22

that is prt c

Answer 23

Thanks.