Have absolutely no idea how to do this
A circle’s area is represented by A = π(x^2 − 22x + 121). What expression represents the radius of the circle?
A. x + 11
B. x − 11
C. x − 22
D. x + 22
MEDAL!!!

Question

Have absolutely no idea how to do this 
A circle’s area is represented by A = π(x^2 − 22x + 121). What expression represents the radius of the circle?
	A.	x + 11
	B.	x − 11
	C.	x − 22
	D.	x + 22
MEDAL!!!

abdullahm · Answer

$\Large\bf Area = \pi r^2$

$\Large\bf (a - b)^2 = a^2 - 2ab + b$

$\Large\bf x^2 - 22x + 121 = ?$

abdullahm · Answer

Whatever you factor it down to is the radius!

kylie.diprimo · Answer

I probably sound really stupid, but I don't get it

abdullahm · Answer

No, it's ok!

Do you know how to factor a trinomial?

kylie.diprimo · Answer

Yes

abdullahm · Answer

All you need to do is factor x^2 - 22x + 121

abdullahm · Answer

Hint:

-11 and -11 add up to -22 
-11 and -11 multiply to 121

kylie.diprimo · Answer

Is it A)x+11

satellite73 · Answer

no because $(x+11)^2=x^2+22x+121$

kylie.diprimo · Answer

Duh, D) x-22 right

abdullahm · Answer

No, $\ (x-22)^2 = x^2 - 44x + 484$

kylie.diprimo · Answer

Oy vey

kylie.diprimo · Answer

Is it B

abdullahm · Answer

Yes

kylie.diprimo · Answer

Thank you I am so embarrassed at my stupidity