How to Subtract a Negative From a Positive

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Subtracting a negative from a positive is something that you can easily do in just a few seconds. Subtract a negative from a positive with help from an experienced math professional in this free video clip.

Part of the Video Series: Solving Math Problems
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Video Transcript

Hi, I am Ryan Ault. I am a physicist and this is how to subtract a negative number from a positive number. Now you can write an equation, you can say R which is your result is equal to A - B. Now normally this is fine but if B happens to be a negative number it changes it up so it's a little bit different. So if be actually goes to a -B we find that R goes to A - (-B). Now the rule is that when you have 2 negatives, a negative subtracted you finds that it actually turns into a positive. So in this example R goes to A + B. Now looking at an example of real numbers lets say A = 3 and set B equal to 1. So initially R is equal to A - B which is equal to 3 - 1 which equals 2. Now when B goes to a -1 we find that R is equal to again A - B but now B is a -1 so it's equal to 3 - (-1) and using our rule above a negative in front of a minus is equal to a plus. So we find that R is actually equal to 3+1 which is equal to 4. I'm Ryan Ault and this is how to subtract a negative from a positive.

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