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@MeowLover17, What is (8x^2 - 5x - 2) + (7x - x^2 + 3) ?

One moment

Rearrange your terms to combine like terms with eachother. It makes it easier to evaluate.

I got +6x^2+2x+1 @Hero

Sorry my computer died

Hello hero i got what i wrote above

So would that be the total length of the two sides??

You should have gotten 7x^2 + 2x + 1

Oh sorry yes i see

So hero 7x^2 + 2x + 1 <- This is my answer for part A correct?

how would i find the length of the third side?

To find the length of the third side subtract the result you got for part A from the perimeter.

That's what i was thinking let me do that

so i would receive -4x^3+10^2+7?

for the length of the third side

Subtract this way:
|dw:1441579511663:dw|

ok

-4x^3 -4x^2-5x-3

Is what i got

and if thats correct please help me with part C because i dont understand what its asking.

What is 4x^3 minus zero?

|dw:1441579942249:dw|

+4x^3

4x^3 -4x^2-5x-3

What is -3x^2 -(-x^2) ?

-2x^2

Yes. When you're subtracting one expression from the other, you have to flip the signs.

Oh i understand i forgot to change the signs

Yes :/

so i get 4x^3-2x^2-5x-9

For the third side

|dw:1441580340586:dw|

|dw:1441580483756:dw|

Okay so i would recieve 4x^3-10x^2-7

Right?

Somehow I wrote the second term incorrectly.

I just noticed that lol

But hero now that i have done gotten part B how do i do part 3?

Part B is 4x^3-10x^2-7 correct?

|dw:1441580817818:dw|

Correct. Your Part B is good.
4x^3 - 10x^2 - 7 is correct.

yes now how do i do part C?

please help

i don't understand what it means :/

oh i see

Is that answer correct for part c?

yes the sum is always a polynomial isnt it?

Thanks you :)