2016 May 25th Edexcel Core 2 Questions and answers. [Unofficial mark scheme] 2016

Awesome Thanks for clearing that up I wasn't quite sure if I was just allowed to remove the logs like that.

Hi guys

if i put 5y + 3x - 95 = 0, will i still get the mark even though it said put it as 'ax + by + c = 0'?

yes

I don't know how i got higher on C2 its weird because I thought C1 would be easier.

any idea what the grade bondaries might be

Can someone explaon how you got part c for question one? I jist tried it now and I got 4.8 but im sure in the exam I got different.

Also the radius for tje circle. I completely forgot the formula so I tried completing the square for which I got like 10.6/ 113

$u_n=ar^{n-1}$
$\therefore |u_9-u_{10}| = |(64)(\frac{3}{4})^{9-1}-(64)(\frac{3}{4})^{10-1}| = 1.602$ (3 d.p.)

$u_n=ar^{n-1}$
$\therefore |u_9-u_{10}| = |(64)(\frac{3}{4})^{9-1}-(64)(\frac{3}{4})^{10-1}| = 1.602$ (3 d.p.)

dont you get negative 1.602 so if you wrote -1.602 as the difference is it wrong

Lol it doesn't matter, they will most likely ignore the sign, they just told you to find the difference its like saying if i had 5 apples one day and had 10 the next day what would be the difference in the amount of apples i had in those 2 days it wont be -5 but just 5 but the minus i think they will ignore so you will get full marks.

1.b. Is wrong. The answer is -1.602. It has to be negative because in geometric sequence, the biggest term is subtract by the smallest.

Therefore 64(3/4)^9 - 64(3/4)^8 = -1.602 (to three decimal places).

P.S. I don't know if the markscheme would say 'ignore' signs.

the answer was b= (3a+5)/9

Do you know how many marks this part was for?

9 d) is wrong, x was a really long decimal. If you used the full decimal you would have got 121.5... Something rounding up to 122. You are not supposed to round x as that is too early.

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