Hi,(adsbygoogle = window.adsbygoogle || []).push({});

In BIDMAS (brackets, indices, division, multiplication, addition, subtraction) it shows clearly that indices should happen before subtraction, so why does -5^{2}=25? Because the real working (according to BIDMAS) should put the square first and then put the negative sign on, which would mean the answer is -25. And then for [itex]\sqrt{negative numbers}[/itex], you have to usei; imaginary numbers. Andiis equal to the square root of -1. But surely the [itex]\sqrt{-25}[/itex] is -5, not 5.

I was told that BIDMAS was correct in every situation and should be applied to ALL mathematics. Is this wrong? If so, is there anything else it shouldn't be applied to?

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Squaring Negative Numbers

Loading...

Similar Threads - Squaring Negative Numbers | Date |
---|---|

B Square root of a negative number in a complex field | Oct 16, 2017 |

B Simplifying roots of negative numbers | Feb 26, 2017 |

Pulling a negative out of a square root | Jan 18, 2016 |

Why is the squared meters negative? | Apr 2, 2015 |

Square Root of a Negative Number? | Jun 3, 2008 |

**Physics Forums - The Fusion of Science and Community**