AQA AS Core 2 maths unofficial MARK SCHEME (25/05/16)

What did everyone get for the 16+9sin^2(x)/5-3cosx

So noone else got 10.7 as the perimeter? I got 4.12 as the value of r??

I think b) was (0.2)^x = 4. Use logs to find out x to 3 sign fig

wasn't the question (2-x)^7

2) a) sketch y = (0.2)^x [2] (negative gradient where the y value decreases exponentially as x increases, with y-intercept at 1 and x-axis being the curve's asymptote)

b) something about solving a log question e.g. (0.2)^x = 8 ? so log that to get x and provide answer to 3sf [3?]

c) transformation that maps the graph y =(0.2)^x onto y = (5)^x [1] answer: y = (1/5)^x there fore replace x with -x to get y = (5)^x so therefore transformation is reflection in y axis.

Im pretty sure the perimeter was like 13.6?? I cant remember and r was either 3.something i think

Yeah I think im wrong a lot of people got 13...hopefully I will get atleast 1 mark for some sort of working out

6 marks will carry at least 2 to 3 method marks so as long as you wrote down the steps you should be ok

I think I equaled the formula for area of a sector to half the area of the triangle or something... does this sound along the right lines?

Yeah that sounds right

Personally I used the identity that Sin^2(x) + Cos^2(x) = 1, rearranged to sub in 1-Cos^2(x) for Sin^2(x) then split the fraction to get (16+9)/5 + -9Cos^2(x)/-3Cosx, which worked out as 5 +3Cosx. Not entirely sure if thats right or not though

Thats okay then, and what did you get for the question asking to find the sum from 4 to 12?

Yes I'd like to know this too because i got 72 but am beginning to think that was wrong. I'm so confused, i found this paper rather difficult.

Wait, was it from 4 to 12?? I'm sure i remember from 4-21??

I got 90

Yeah it seems everyone did.....I don't know what i did wrong, it looks like i forgot to add on 28 or something?

I got 88 - looks like I messed up

I have contracted AIDS from that paper

what did people get for the transformation onto y=3√x^2+1? I'm not sure if that was the question asked correct me if I'm wrong??


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