Edexcel C3 June 2015 Question 3

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This is a very standard type of C3 question that you might see which is a nice break from the normal of this so far.

This is one of those 'R' formulas
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how did you get the negative -77.079 value from? i'm very confused

SuperJammytube
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If the value is 2root5 and 2Theta - 26.57=0? How does that give us no solutions??

AndrewJames