Question

Does anybody know what ± means? I'll medal.

Answer 1

it is two numbers, plus or minus

Answer 2

shorthand
if you say
\[x^2=25\\x=\pm5\] you really mean
\[x=5\] or \[x=-5\]

Answer 3

oh okay. Thank you @misty1212

Answer 4

Yes, we also usually use this for error calculations if you are in the sciences, \[some~number \pm 0.001\] so you can add 0.001 or minus 0.001. Very useful :)