1. ## Order of Operations

Hi Everyone,
I really could use your help with this problem. For some reason it's not making sense to me. I'm sure once I see how it is done I will realize how easy it is.

(9^2-2)-(9-9^2-8)

I know the answer is 159, but I can't figure it out.

Thanks for any help

2. $\displaystyle (9^2-2)-(9-9^2-8)$

$\displaystyle = 9^2-2-9-(-)9^2-(-)8$

$\displaystyle = 9^2-2-9+9^2+8$

$\displaystyle = 81-11+81+8$

$\displaystyle = 159$

3. Originally Posted by bluecat
hi everyone,
i really could use your help with this problem. For some reason it's not making sense to me. I'm sure once i see how it is done i will realize how easy it is.

(9^2-2)-(9-9^2-8)

i know the answer is 159, but i can't figure it out.

Thanks for any help
$\displaystyle (9^2-2)-(9-9^2-8)$

$\displaystyle (81-2)-(9-81-8)$

$\displaystyle (79) - (-80)$

$\displaystyle 79+80$

$\displaystyle 159$

4. Thanks so much for helping me out.
I see now where I got stuck...(79)-(-80)

I totally forgot to "Draw the line and change the sign"

Thank you very much