Question

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

Side 1: 3x2 - 4x - 1
Side 2: 4x - x2 + 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 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

@SolomonZelman @precal @Haseeb96

Answer 2

@JoannaBlackwelder @aaronq @blahhedup101 @MaimiGirl

Answer 3

@SolomonZelman Help please!!!!!

Answer 4

I think I got the first part
@SolomonZelman

Answer 5

first figure out your missing side
they should add up to the given perimeter

Answer 6

hmm i dont understand @precal

Answer 7

@precal i am so confused

Answer 8

you have to add up like terms

Answer 9

do you have any given x^3 terms?

Answer 10

I got 7x^3-5x^3+4

Answer 11

is that right? @precal

Answer 12

no because you were not given any x^3 terms at all.

Answer 13

side 3 is : 5x^3 well that is one of the terms

Answer 14

can you show me?

Answer 15

like what do I do?

Answer 16

@precal I am so confused now right?

Answer 17

l

Answer 18

what is 2x^2

Answer 19

you need -2x^2
so _______ + 2x^2 gives you - 2x^2

Answer 20

3x^2-x^2 gives you 2x^2

Answer 21

ok what would that do for me? is that the total lenght of both sides?

Answer 22

The perimeter is The perimeter of the triangle is 5x3 - 2x2 + 3x - 8.

Answer 23

Can you show me how to find the answer ??? @precal

Answer 24

perimeter just means add the sides
you are just combining like terms, one of the basic concepts you learn in Algebra 1

Answer 25

you need -2x^2
so _______ + 2x^2 gives you - 2x^2

Answer 26

___ + 2=-2

Answer 27

-4