Question

So apparently x^2 + 2^2 = 3^2
Is: +-sqrt(5)

How do you get to this?
I get +-sqrt(23)

Answer 1

\[x^2 + 2^2 = 3^2\]
\[x^2=3^2 - 2^2\]
\[x^2 = 9- 4\]
\[x^2 = 5\]

Answer 2

Does that make sense?

Answer 3

how do you get sqrt(23) ?

if you immediately change 2^2 = 2*2 to 4
and 3*3 to 9
you have
x^2 +4= 9

Answer 4

I'm an idiot....... :)

Answer 5

thanks!