a) I did this: however the answer should be : b) another one however the answer should be c) last one don't know what to do after this step
Last edited by Devi09; Mar 29th 2011 at 09:38 AM.
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Your basic algebra skills are in need of some real work. gives .
Originally Posted by Plato Your basic algebra skills are in need of some real work. gives . still not getting the answer
Originally Posted by Devi09 still not getting the answer The given answer is wrong.
Originally Posted by Devi09 a) according to your next line, that should be 2x+3 in the numerator which will give the answer provided I did this: why didn't you multiply BOTH sides by 3 ? Now you multiplied only the left side by 9. If you multiply only one side by something other than 1, you will have a different inequality. however the answer should be : b) another one You halved the right and did nothing to the other side, so you now have a different inequality altogether. You could have multiplied both sides by 4. You multiplied the left by 4 and changed the denominator of the other side. Any reason ? You multiplied the left by 8 and made a mysterious modification to the numerator on the right again. The rest is also haphazard. however the answer should be c) last one don't know what to do after this step For the last one, you cannot have since x+1 is 2 greater than x-1
For b) 2nd try
Originally Posted by Devi09 For b) 2nd try Let's see why that solution is not correct. According to your solution works. Plug it in an see that it does not. According to your solution does not works. Plug it in an see that it does work. Here is simple algebra. Then we get HOW?
Originally Posted by Plato Let's see why that solution is not correct. According to your solution works. Plug it in an see that it does not. According to your solution does not works. Plug it in an see that it does work. Here is simple algebra. Then we get HOW? So when you multiply by 4 you don't multiply the denominator being 2 in this case So its:
Originally Posted by Devi09 So when you multiply by 4 you don't multiply the denominator being 2 in this case So its: Way to go! By George you have it.
One more thing.... this is what I did: What do you do with the x's? move them to the middle x?
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