me
Crazy Mango Extraordinaire
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Post by me on Jun 10, 2015 12:18:25 GMT 7
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me
Crazy Mango Extraordinaire
Posts: 6,342
Likes: 3,980
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Post by me on Jun 10, 2015 12:20:57 GMT 7
better like this
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Deleted
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Post by Deleted on Jan 31, 2016 16:18:16 GMT 7
I have the following rational inequality
1/4(x+2) <= -3/4(x-2) By adding +3/4(x-2) I simplify to (x+1)/(x^2 - 4) This gives intervals for f(x)<=0 as (-ve infinity to -2) and [-1 to 2) +2 & -2 being excluded as they are the vertical asymptote so
Question
a) if I solve the same inequality by cross multiplying the denominator of term on the left to the numerator of the term on the right and cross multiplying denominator of term on the right to the numerator of the term on the left and remove the 4 as they are on both sides, I get
((x-2)/(x+2)) + 3 <=0 (x-2+3x+6)/(x+2) <=0 (4x+4)/(x+2) <=0 Which I can simplify to 2(x+2)/(x+2)<=0 2<=0
This is not true. So why is the 2nd approach giving me this incorrect result? If this is not permissible, pl can you explain why?
Thank you
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Deleted
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Post by Deleted on Jan 31, 2016 16:19:38 GMT 7
^^^ found on a beer coaster at the pub.
I may be some time.
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