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Beginning Algebra ch1.6 - who couldn’t like you decides...

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Beginning Algebra MTH 095 FALL 2011 Moraine Valley Community College Chapter 1.6: Subtracting Real Numbers If you feel solid with adding real numbers I’m not going to do too much to add (pun intended) to that to help you understand how to subtract real numbers. It’s basically the same idea – just with a twist. Just like last time I have two cases; they’re a little different, though, so keep your eyes peeled for what’s going on! Case I: -5 - -8 = -5 + 8 = 3 5 - - 8 = 5 + 8 = 13 -2 - -5 = -2 + 5 = 3 2 - -5 = 2 + 5 = 7 Do you see what happened? We were subtracting a negative number. You may wonder when on earth that would ever happen in real life but it does happen pretty often. Let’s pretend that you have a rich Uncle Moneybags. You borrowed $10000 money from him to buy a car. So you have a debt of $10000, which we’ll call having $-10000. Now let’s say that Uncle Moneybags, because he decides he likes you (and
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Unformatted text preview: who couldn’t like you?), decides to “forgive” $5000 of that debt. He’s removing it from your life. If someone subtracts debt that you owe, aren’t you richer for it? It’s subtracting (removing) a negative (debt). This turns into a positive. This is how it works! Case II:-4 – 7 = -11 (think of it as -4 + - 7) 4 – 7 = -3 (think of it as 4 + - 7)-5 – 7 = -12 (think of it as -5 + -7) 5 -7 = -2 (think of it as 5 + - 7) Are you comfy with subtracting a negative being the same as a positive? Well, this time we’re going to go the opposite way. If you’re ever confused because you’re asked to subtract something here’s a similar way to think of it: think of it as adding debt. If you add debt you’re poorer, right? Your checking account has less money in it, right? It’s the same basic principle. I hope this helps! Please let me know if I can be of further assistance....
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Beginning Algebra ch1.6 - who couldn’t like you decides...

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