Edexcel A2 C3 Mathematics 12th June 2015 Watch

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Nurishment
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#1041
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#1041
(Original post by games211)
is it 2 to the power of y?
I got log2(x) = (y)/ln(2)
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Nirm
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#1042
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Anyone know any interesting and/or a few of the hardest Edexcel (no solomon because they do my head in ) C3 past papers?
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ridirahman
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#1043
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#1043
(Original post by Nirm)
Anyone know any interesting and/or a few of the hardest Edexcel (no solomon because they do my head in ) C3 past papers?
http://www.physicsandmathstutor.com/...-maths-papers/
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Medicjug
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#1044
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#1044
(Original post by Nurishment)
I got log2(x) = (y)/ln(2)
Yeah me too


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Medicjug
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#1045
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#1045
Can you also say it equals ylog2e


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Gome44
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#1046
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#1046
(Original post by Nirm)
Anyone know any interesting and/or a few of the hardest Edexcel (no solomon because they do my head in ) C3 past papers?
June 2013 is the hardest. Just have a look at the grade boundaries, if they are low for one year the paper was hard
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arsenalfc97
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#1047
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#1047
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

Is there a mistake in the mark scheme for 3b? in the mark scheme it says the second solution is from -2x-5=3-x

shouldn't it be from -(2x-5)=3-x? I wouldn't be surprised if mark scheme is wrong as is for the withdrawn june 2013 paper
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Gome44
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#1048
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#1048
(Original post by arsenalfc97)
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

Is there a mistake in the mark scheme for 3b? in the mark scheme it says the second solution is from -2x-5=3-x

shouldn't it be from -(2x-5)=3-x? I wouldn't be surprised if mark scheme is wrong as is for the withdrawn june 2013 paper
No, the markscheme is correct, as the | | are only around the x! not the whole function
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arsenalfc97
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#1049
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#1049
(Original post by Gome44)
No, the markscheme is correct, as the | | are only around the x! not the whole function
oh yeah haha. thanks
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Gome44
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#1050
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#1050
(Original post by arsenalfc97)
oh yeah haha. thanks
Just reread my post, sorry if the ! seemed a bit aggressive, it was supposed to be a comma
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dandroff
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#1051
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#1051
(Original post by Anon-)
What do you mean take the cosx out? You can't really do much after sqrt(3)sinx - cosx = 0
do cosx (root3 tanx - 1) =0
so cos x = x
and tanx = 1/root3 then solve the x's
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Nirm
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#1052
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#1052
(Original post by Gome44)
June 2013 is the hardest. Just have a look at the grade boundaries, if they are low for one year the paper was hard
Just tried it, i got 56/75. Got destroyed by it haha. I need to work way more now.

And also does anyone know a list (or maybe its in the spec? i am not too sure) of like all the graphs we should know, i mean like y=x^(1/2)? Because i didn't know how to do and pretty sure would have gotten it wrong if i was in the exam.
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it's a me, mario
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#1053
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#1053
Yo

How do you draw something like |x^2 + 3| + 2x?

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precious maro
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#1054
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#1054
god please grant me 90% average in c3 and c4. done all the c4 papers but only about 5 c3 papers, c3 seems straightforward but in the exam hall you just lose silly marks
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JadeJadus
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#1055
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#1055
Square both sides, collect terms, factorise if you can then find the value of x
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Jonnyss
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#1056
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#1056
How do you do the work out the minimum value and the smallest possible value of x questions? Also for when it asks for the maximum and greatest possible value? I never understand them.

Also any method for working out range and domain of reciprocal graphs?
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Medicjug
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#1057
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#1057
Hey guys for the cosecx and secx graph what do the horizontal asymptotes mean I've never learned about them???


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Andy98
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#1058
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#1058
(Original post by Medicjug)
Why does x=something have a gradient that tends to infinity??


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1/0=infinity

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Gome44
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#1059
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#1059
(Original post by it's a me, mario)
Yo

How do you draw something like |x^2 + 3| + 2x?

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X^2 + 3 is always positive anyway, so you can just remove the mod sign
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Nurishment
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#1060
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#1060
(Original post by Medicjug)
Hey guys for the cosecx and secx graph what do the horizontal asymptotes mean I've never learned about them???


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The asymptotes will be where their reciprocal graphs (cos(x) and sin(x)) meet the x-axis (when the function = 0) e.g. for the sec(x) graph, there will be an asymptote at 90 degrees and then 270 degrees likewise at -90 degrees and -270 (that's when cos(x) crosses the x-axis)
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