kalid I do not agree

Great question. What’s funny about negatives is they were invented/discovered in the 1700s, confused people, and then finally made sense with analogies like debt. But for many decades they were considered “evil” (if positive is good, what’s negative?).

Philosophically, the ability for numbers to have multiple dimensions is an option available to us — we need to find good ways to use it. (Like having a car that can drive backwards… if you never use it, that’s fine, but the ability is there!)

One modern application is tracking things in multiple dimensions. Many computer graphics engines use advanced complex numbers (called quaternions) to keep track of rotations. In physics and engineering, complex numbers are used to keep track of several variables at once in a circuit.

The better we understand complex numbers, the more uses we come up for them.

You can try this yourself: If you are 1 mile East, where should you be after a single rotation? Two rotations? Should your distance from the center change?