Does this warrant marks?(Maths)
I've been attempting some Edexcel New GCSE maths questions, and upon solving a question I happened to get a different (but similar) answer to the mark scheme, because there is more than one way of solving the question.
The question and answer was:
But my answer was
3r+7
------ = a
2-r
The difference in the methods was that I rearranged (ra) and (+7) instead of (3r) and (2a). Will I still get marks? The mark scheme does not mention my answer but I'm pretty adamant it's correct..
The question and answer was:
But my answer was
3r+7
------ = a
2-r
The difference in the methods was that I rearranged (ra) and (+7) instead of (3r) and (2a). Will I still get marks? The mark scheme does not mention my answer but I'm pretty adamant it's correct..
Original post by Alexion
(3r-7)/(2-r) would be the only other correct answer. Yours is wrong, sorry.
Oh right thanks, looking back on my working I see where I went wrong.
But if I wrote that in an exam would I get marks (as its not on the mark scheme)?
You've made a mistake with the sign- you carried the 7 over but didn't change the sign hence you've got the wrong answer 
Original post by Gabzinc
Oh right thanks, looking back on my working I see where I went wrong.
But if I wrote that in an exam would I get marks (as its not on the mark scheme)?
But if I wrote that in an exam would I get marks (as its not on the mark scheme)?
Whether you get any marks would probably depend on how many marks the question was- but I'd wager either 1 mark or none
Original post by Poooky
Whether you get any marks would probably depend on how many marks the question was- but I'd wager either 1 mark or none
I mean if I wrote 3r-7/2-r (which is also correct, not the mistake that I made)
Original post by Gabzinc
I mean if I wrote 3r-7/2-r (which is also correct, not the mistake that I made)
In that case you'd get full marks, both answers are the same
(multiply your numerator and denominator by -1, you get the same answer as the mark scheme)Original post by Poooky
In that case you'd get full marks, both answers are the same (multiply your numerator and denominator by -1, you get the same answer as the mark scheme)
(multiply your numerator and denominator by -1, you get the same answer as the mark scheme)Great! Thanks for all your help
Original post by Gabzinc
I mean if I wrote 3r-7/2-r (which is also correct, not the mistake that I made)
Yeah, if it's an equivalent answer you'd definitely still get the marks for it
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