EighthMersennePrime

Please wait, I'm going to try to type the WHOLE working out in Latex so might take some time. I am also not really good as Latex so I'm going to use this as practice.

Thank you! :)

Thee answer is 8 :)

No thanks.

I use Khan Academy but I have not seen this video yet, thanks, I take a look.

9/11=0.818182

${5 \over -10}$

$-0.5$

Sorry I took so long because it is hard to write in LaTeX.

I don't know if this explains why but... it's because the answer has separate solutions, the two solutions can be written as ${(8y-11)^2}=169 \\ \downarrow Square-root \space both \space of \\ the \space equation \\ 8y-11=±13 \\ \downarrow Separate \space the \space solutions \\ 8y-11=13 \\ or \\ 8y-11=-13$

and this is why there are two answers.