Difficulty solving a radical, could you please help show

>>8224295
accept the fact that you will best serve society as a janitor and move on.

>>8224295
Order of operations.

>>8224297
Thanks, but im trying, and that is not helping.

>>8224298
Sorry mate, im not seeing what I did wrong, I'll need a little more info if you could please.

>>8224295
Your multiplication on the top is fucked. It looks like you forgot to square the first term.

(a-b)(a-b)
= (a-b)a + (a-b)(-b)
= a^2 - ba - ba + b*2

File: proper.jpg (9KB, 111x202px) Image search: [Google]

9KB, 111x202px

>>8224295
Here ya go, will post another pic of where your mistake(s) was/were too.

>>8224295
You're actually both wrong. When you expanded your numerator you forgot to square the sqrt{2}, and your teacher forgot to divide by -7. Great job with the maths there, 'murca.

Also, pretty sure sub-forum rule #1 is "No homework threads"

>>8224306
>>8224307

Thank you very much,

>>8224309

I do apologize then it was told to ask here.

>>8224295
After the first equality, you forgot parentheses in the numerator.
You then proceded to distribute instead of FOIL

>>8224312
>forgot parentheses

Thank you very much for your help.

I have the answer now and thank you all for your quick help on this.

>>8224309
>sub-forum
Kill yourself, redditor. It's a BOARD.

>>8224295
>solving a radical
What is this supposed to mean? Using correct terminology is important.