Beginning Algebra ch1.6 - who couldnt 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 couldnt like you?), decides to forgive $5000 of that debt. Hes removing it from your life. If someone subtracts debt that you owe, arent you richer for it? Its 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 were going to go the opposite way. If youre ever confused because youre asked to subtract something heres a similar way to think of it: think of it as adding debt. If you add debt youre poorer, right? Your checking account has less money in it, right? Its the same basic principle. I hope this helps! Please let me know if I can be of further assistance....
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This note was uploaded on 11/15/2011 for the course MTH 095 taught by Professor J.king during the Fall '11 term at Moraine Valley Community College.

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Beginning Algebra ch1.6 - who couldnt like you?), decides...

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