# Glossary for Lesson 15: Quadratic Formula

### Plus or Minus (\pm)

The plus or minus sign \pm is used to indicate that the value to its can be either added or subtracted to the value to its left.  For example, 8\pm 3 is a way of writing 8+3 or 8-3 using just one expression.  To write this symbol with MathQuill, type \pm and then a space.