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Other Chat For non-Pokemon discussion on everything else. For casual talk only, any more serious topics such as current events, should be in the Discussion. You can talk about anything else that is not covered in the other "Other Boards" that are above.


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  #1  
Old 02-13-2012, 10:07 PM
SeaFire Offline
 
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Default Complex Multi-Step Inequality Problem

Not asking for anyone to do my homework for me, but I need some tutorial or something on how to do problems like this: 4(1-3n)-14>4(2n+3)-9n.

Even the most simple problems that are similar to that I can't solve.

Can someone help?
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  #2  
Old 02-13-2012, 10:38 PM
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Default Re: Complex Multi-Step Inequality Problem

You solve it the same way you'd solve a regular equation with a = sign.

The main difference is if you divide or multiply by a negative number, you need to switch the inequality sign around.

This site might help. It goes through each step of the process if you're having trouble. http://webmath.com/solverineq.html

Here's how I would do it. I haven't done this stuff in 5 years so hopefully it's right. XD

4(1-3n)-14>4(2n+3)-9n

Step 1. Expand the brackets
4-12n-14>8n+12-9n

Step 2. Simplify
-10-12n>-n+12

Step 3. We need all the n's on one side, so +n to each side.
-10-12n+n>12

Step 4. We need the regular numbers on the opposite side so +10 to each side.
-12n+n>12+10

Step 5. Simplify
-11n>22

Step 6. Divide both sides by -11 to get n by itself. (Since dividing by a negative number, switch the inequality sign to point the opposite way.)
n<22/-11

Step 7. Simplify
n<-2
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Old 02-13-2012, 10:42 PM
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Default Re: Complex Multi-Step Inequality Problem

Thank you! I don't have to sit in class without a clue on how to do this!
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Old 02-14-2012, 04:26 AM
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Default Re: Complex Multi-Step Inequality Problem

Nice job Sarah!

I remember when we used to have people post parts of their homework on the forums so people could help them. Good to see we still got it.
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Old 02-14-2012, 06:08 AM
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Default Re: Complex Multi-Step Inequality Problem

Hmm, sounds like fun, that should totally be brought back! Too bad I rarely need homework help. :/
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Old 02-17-2012, 11:11 PM
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Default Re: Complex Multi-Step Inequality Problem

BARF! I took algebra two years before the average person should... It was the single worst year of my life. Undeniably.
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