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SP8 Apr 23 Q2

B

barns

Made first post
Hi

Could someone tell me what the step is from the first equation to the second equation in the examiners report please when trying to get ZB>ZA?

How did they get from n/(n+391) > sqrt(n)/40 to sqrt(n)/(n+391) > 1/40? Where did the sqrt(n) come from in sqrt(n)/(n+391) > 1/40?

Thanks
 
Thanks for your reply - Why can we not just do n/(n+391) > 1/40, why do you need to divide both sides by sqrt(n)?
 
Hi Barns

Just basic algebra? Maybe you've not realised that sqrt(n)*sqrt(n)=n. Note your formula in your second post is different from that in your first post.

Ian
 
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