Symbols:Plus or Minus/Examples/Arbitrary Example 1

Examples of Use of Plus or Minus Symbol

Let $x^2 = 49$.

Then:

$x = \pm 7$

This means that the equation $x^2 = 49$ has $2$ solutions: $x = 7$ and $x = -7$.

Sources

• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): plus/minus sign