# Hard inequalities question

by nokia8650
Tags: inequalities
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 P: 224 I am having trouble with the final part of this question - part f; I can do all the previous parts. I have attached the questions and markscheme, and so woulkd appreciate it if someone could just explain part (f) to me! Thanks alot.
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,345 If (f) is the part you are having trouble with, then presumably you have already proved that $2x_n^2- (2n-1)x- (n+1)= 0$ (part (e)). Now you want to find the smallest n such that $x_n< n+ 0.05$. You could, for example, solve that using the quadrative formula and compare the solutions to n+ 0.05. Have you calculated some values of $x_n$? What are $x_0$ $x_1$, etc.?
 P: 224 Thanks for the help. Im still confused as to how the markscheme answers have come about which I attached above. Thanks

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