Pythagorean Theorem Help Please!

I know how to get the answer, I just can't figure this one out. I will post it below thanks!!!

Question

Pythagorean Theorem Help Please! 

I know how to get the answer, I just can't figure this one out. I will post it below thanks!!!

bookworm14 · Answer

attachment

bookworm14 · Answer

I don't understand how to put this in radical form

geerky42 · Answer

What is AC?

anonymous · Answer

it is 7.4  you do 8^2-3^2=a^2   64-9=55   $$\sqrt{55}$$=7.4

bookworm14 · Answer

I did $$8^2 - 3^2= 55$$ but how do I put that in $$?\sqrt{?}$$ form?

bookworm14 · Answer

Yes I got 7.4, but I need it in radical form, which is the only part I do not know how to do.

geerky42 · Answer

If it's just $\sqrt{55}$, then just put in $1\sqrt{55}$

55 is multiply of two prime numbers, so you cant simplify any more.

geerky42 · Answer

Are you using Khan Academy lol

bookworm14 · Answer

Okay, I was thinking that but I second guessed myself because what would be the point in using a 1? lol and yes khan academy :)  I am actually *really* advanced smarts wise, guess you can't tell considering i got stuck on something so simple

bookworm14 · Answer

@geerky42  it was right x_X 
$\Huge\color{purple}{\heartsuit\ddot\smile\heartsuit}\large\color{blue}{Thanks~!~!}$

geerky42 · Answer

Awesome. You are welcome :)