quick algebra question?

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- anonymous

quick algebra question?

- chestercat

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- anonymous

the area of a square is 5 more than its perimeter. find the length of a side.

- anonymous

my work so far:
4r=r^2+5
r^2-4r+5=0
then I am supposed to factor? I cannot figure out how to factor this! I literally tried every possible way.. :( someone please help me?

- anonymous

Good morning I think I mIght be able to assist

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## More answers

- anonymous

I bRelieve your doing it correctly so far

- anonymous

awesome thanks!

- anonymous

Hey that's what I'm here for

- anonymous

Brb

- anonymous

Ok I'm back Olivia

- anonymous

And thX for the compliment I appreciate it

- anonymous

ok im here!
:)

- amistre64

Are we reading it correctly?
Area = Perimeter + 5
how do we define area and perimeter of a square ?

- anonymous

yes I believe so.. And im not sure, I honestly just follow the practice problems along with the actual problem to solve it. :/

- amistre64

area, is 5 more than perimeter
area = perimeter + 5
area = r^2, and perimeter is 4r
youre initial setup seems flawed to me

- anonymous

ok, like i said I was just following the practice problem so the way I set it up is probably wrong. how would you set it up?

- amistre64

the way i have already set it up ...
area = perimeter + 5

- anonymous

ok but how would i solve that? thanks for ur help btw!

- amistre64

the area of a square is 5 more than its perimeter
^^^ = ^ ^^^ ^^^^^^^
r^2 = 4r + 5
area = perimeter + 5
------------------
but you setup as:
4r = r^2 + 5
perimeter = area + 5
-------------------
solving it is just finding the solutions to the quadratic, factor if you can (it most likely factorable)

- amistre64

r^2 -4r -5 = 0

- anonymous

ok give me a second to factor it

- amistre64

any thoughts about how we could factor it?

- amistre64

k

- anonymous

(r+1)(r-5)=0

- amistre64

you did fine with the factoring

- anonymous

ok, so it would solve to be r=-1, and r=5...so it would be 5 units?

- amistre64

5 is the workable length, -1 is just a extra value that doesnt fit with the expected domain and can be ignored
5 is fine

- anonymous

yay is what right! thanks so much for your help it was a lot easier than i thought :p

- amistre64

ive had years of practice :) youll do fine

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