So i’m trying to understand more about math. For the operation – – = +, what would be a real life example of me meeting with that situation?
Thank you!
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An example is if you want to calculate what happens in a scenario where you remove a negative thing.
We have 100 eggs minus the 20 we borrow. We have 80 eggs. 100-20=80 eggs we have.
Now we got back the 20 eggs.
80+20=100.
To do this two calculation, we had to write two different formulas: A-B=C and C+B=A
It was easy to do. But if the calculation was more complex, it would have needed more thought and time.
However. Instead of rewriting the equation every time, we can use the same equation all time, using positive and negative inputs.
Here it is: Stock – borrow = Eggs. S-B=E
Now when eggs go out it borrow is a positive value, and we use a negative value when those are given back.
You borrow eggs: S-B=E. 100-(+20)=80
Eggs are returned S-B=E. 80-(-20)=100
In this case, whatever happens to your eggs, you just need a single equation to be applied. We moved the thinking into putting the data in the equation instead of making a new equation.
This method offers a big advantage, let me show you how again:
Eg: Electricity. You just need to know and remember a single equation:
V=R x I
What is the voltage change in this point of a circuit if I reduce the resistance by 1 with a current of 2 left to right? It’s:
V=R x I V= (-1) x 2 = -2
What is the voltage change in the same spot with a reverse current of 2?
V=R x I V= (-1) x (-2) = +2
Hope it makes sense. Integer gets you ready to use positive and negative data, and use that in a equation. Very useful to speed up more complex calculations later on.
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