anonymous one year ago Does anybody know what ± means? I'll medal.

1. misty1212

it is two numbers, plus or minus

2. misty1212

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

3. anonymous

oh okay. Thank you @misty1212

4. Astrophysics

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 :)