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# polynomial and rational inequalities

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1. If x is real , prove that
2. the question is c
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3. (Original post by Akhito Kanbara)
If x is real , prove that
Difficult, since if x=0, then your rational function equals 1/3 which is greater than 1/13.
4. (Original post by ghostwalker)
Difficult, since if x=0, then your rational function equals 1/3 which is greater than 1/13.
so the question is wrong? x is real means that it can be any real number, However,when x=0 is substituted , the range does not apply.
5. (Original post by Akhito Kanbara)
so the question is wrong? x is real means that it can be any real number, However,when x=0 is substituted , the range does not apply.
Can't make sense of your last sentence.

x is real means the inequality holds for all real values of x. So, it must hold for x=0; but it doesn't. Hence you're trying to prove something which is actually false - can't be done.
6. Posted from TSR Mobile
Ya that s what i am trying to say

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