Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

S2 June 2014R Edexcel Question 7d

I have looked at the mark scheme and model answers and I don't get how you do this part.

https://www.dropbox.com/s/mig8e80egspup91/Screen%20Shot%202016-06-27%20at%2000.04.12.png?dl=0

Original post by atoner420

I have looked at the mark scheme and model answers and I don't get how you do this part.

https://www.dropbox.com/s/mig8e80egspup91/Screen%20Shot%202016-06-27%20at%2000.04.12.png?dl=0

You have E(R) = E(aX^2 + bX) = aE(X^2) + bE(X), which you should be able to work out.

OP

Original post by HapaxOromenon3

You have E(R) = E(aX^2 + bX) = aE(X^2) + bE(X), which you should be able to work out.

Thanks man, I got it now. I had just never come across a question like it and it confused me lol.

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