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

Side 1: $5x^2 + 2x - 3$
Side 2: $8x - 3x^2 + 2$

The perimeter of the triangle is $2x^3 - 5x^2 + 4x - 8$

What is the total length of the two sides, 1 and 2, of the triangle?

Question

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

Side 1: $5x^2 + 2x - 3$ 
Side 2: $8x - 3x^2 + 2$

The perimeter of the triangle is $2x^3 - 5x^2 + 4x - 8$

What is the total length of the two sides, 1 and 2, of the triangle?

nincompoop · Answer

that's easy

camerondoherty · Answer

Um, I was thinking 
$$2x^2+10x-1$$ Pretty sure i screwed up in my math though

nincompoop · Answer

do you think the perimeter has anything that you need to solve for the length of the two sides given?

camerondoherty · Answer

No, but there are a few other parts in the question tht may be of use in tht

nincompoop · Answer

your math is okay

camerondoherty · Answer

Oh fr?
So I have it right?
Wow, Thanks! :3

camerondoherty · Answer

If I wanted to find the missing angle would i subtract?

camerondoherty · Answer

Subtract the perimeter from the sum

nincompoop · Answer

angle?

nincompoop · Answer

yeah subtract

camerondoherty · Answer

*side

nincompoop · Answer

you mean side

camerondoherty · Answer

Yea Haha cx

nincompoop · Answer

side 1 + side 2 + side 3 = perimeter

nincompoop · Answer

perimeter - (side 1 + side 2) = side 3

camerondoherty · Answer

So...
$$(2x^3 - 5x^2 + 4x - 8)-(2x^2+10x-1)$$

nincompoop · Answer

let us say A, B, C 
if A+B+C = P 
then 
A - A + B - B + C = P -A -B  
C = P-A -B

nincompoop · Answer

yes

camerondoherty · Answer

A-A
B-B?
Lmao brb

nincompoop · Answer

ye, because we want to isolate C by itself