1. Originally Posted by VonNemo19
You plugged 'em in right, but unfortunately arrived at the wrong answer. What did you do after that?

Look at my last post for a hint.
lol I have no idea what to do after that, and yup it can't be negative. Welll..... x^2 - 2xy + y^2 wouldn't have anything to do with it, would it?

2. Originally Posted by marie7
lol i have no idea what to do after that, and yup it can't be negative.
$\displaystyle (3)^2+(-6)^2+(5)^2+(-12)^2=?$
Originally Posted by marie7
Welll..... X^2 - 2xy + y^2 wouldn't have anything to do with it, would it?
No... But that's the sign of a mathematician - you noticed some squares, and then you started thinkin about how to simplify. Very good.

3. $\displaystyle (2+1)^2+(-3-3)^2+(10-5)^2+(-5-7)^2$$\displaystyle =3^2+(-6)^2+5^2+(-12)^2=9+36+25+144=214.$

I am so done with this thread...

4. Okay I can see AlephZero's post. -6^2 is 36 not -36. Thanks a lot everyone

5. Originally Posted by marie7
I got -146 again! What am I doing wrong? lol
Haha. Take a breath, clear your mind......

$\displaystyle (2+1)=3$ Squre it and get 9

$\displaystyle (-3-3)=-6$ Square It and get +36

$\displaystyle (10-5)=5$ Square it and get 25

$\displaystyle -5-7=-12$ Square it and get +144